diff --git a/CHANGES.txt b/CHANGES.txt
index 5177ac7..69ffb3c 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -4,6 +4,14 @@ Changelog
 2.2.1 (unreleased)
 ------------------
 
+- For migrations of comments without a valid old_status, apply the 'published'
+  state.
+  [thet]
+
+- Re-apply eleddy's "Revert modification date since this is fixed in
+  p.a.caching now." as her commit was lost later on due to some git magic.
+  [thet]
+
 - Remove submitting the controlpanel form again after removing disabled tags
   fixes #13037 and #12357
   [maartenkling]
diff --git a/plone/app/discussion/browser/javascripts/comments.js b/plone/app/discussion/browser/javascripts/comments.js
index 6519202..9678c6d 100644
--- a/plone/app/discussion/browser/javascripts/comments.js
+++ b/plone/app/discussion/browser/javascripts/comments.js
@@ -127,16 +127,16 @@
                                               parents().
                                               filter(".comment").
                                               find(".reply-to-comment-button");
-            
+
             /* Find the reply-to-comment form and hide and remove it again. */
             $.reply_to_comment_form = $(this).parents().filter(".reply");
             $.reply_to_comment_form.slideUp("slow", function () {
                 $(this).remove();
             });
-            
+
             /* Show the reply-to-comment button again. */
             reply_to_comment_button.css("display", "inline");
-        
+
         });
 
 
diff --git a/plone/app/discussion/browser/javascripts/javascripts.txt b/plone/app/discussion/browser/javascripts/javascripts.txt
index 59fffb5..99f3056 100644
--- a/plone/app/discussion/browser/javascripts/javascripts.txt
+++ b/plone/app/discussion/browser/javascripts/javascripts.txt
@@ -17,7 +17,7 @@ content object. Each comment div has a unique id::
       <div class="documentByLine"></div>
       <div class="commentBody"> </div>
       <div class="commentActions">
-        <button class="reply-to-comment-button">Reply</button> 
+        <button class="reply-to-comment-button">Reply</button>
       </div>
     </div>
 
@@ -34,7 +34,7 @@ The comment form is rendered inside a "commenting" div::
         <div id="formfield-form-widgets-in_reply_to">
           <input id="form-widgets-in_reply_to"
                  name="form.widgets.in_reply_to" value=
-                 type="hidden" 
+                 type="hidden"
            />
         </div>
       </form>
diff --git a/plone/app/discussion/browser/javascripts/moderation.js b/plone/app/discussion/browser/javascripts/moderation.js
index a5cade1..320477d 100644
--- a/plone/app/discussion/browser/javascripts/moderation.js
+++ b/plone/app/discussion/browser/javascripts/moderation.js
@@ -1,22 +1,22 @@
 /******************************************************************************
- * 
+ *
  * jQuery functions for the plone.app.discussion bulk moderation.
- * 
+ *
  ******************************************************************************/
 
 (function ($) {
-    // This unnamed function allows us to use $ inside of a block of code 
+    // This unnamed function allows us to use $ inside of a block of code
     // without permanently overwriting $.
     // http://docs.jquery.com/Using_jQuery_with_Other_Libraries
-    
+
     //#JSCOVERAGE_IF 0
-    
+
     /**************************************************************************
-     * Window Load Function: Executes when complete page is fully loaded, 
+     * Window Load Function: Executes when complete page is fully loaded,
      * including all frames,
-     **************************************************************************/  
+     **************************************************************************/
     $(window).load(function () {
-    
+
         /**********************************************************************
          * Delete a single comment.
          **********************************************************************/
@@ -47,8 +47,8 @@
                 }
             });
         });
-        
-        
+
+
         /**********************************************************************
          * Publish a single comment.
          **********************************************************************/
@@ -78,8 +78,8 @@
                 }
             });
         });
-        
-        
+
+
         /**********************************************************************
          * Bulk actions for comments (delete, publish)
          **********************************************************************/
@@ -116,8 +116,8 @@
                 selectField.find("option[value='-1']").attr('selected', 'selected');
             }
         });
-        
-        
+
+
         /**********************************************************************
          * Check or uncheck all checkboxes from the batch moderation page.
          **********************************************************************/
@@ -134,12 +134,12 @@
                 $(this).val("0");
             }
         });
-        
-        
+
+
         /**********************************************************************
          * Show full text of a comment in the batch moderation page.
          **********************************************************************/
-        $(".show-full-comment-text").click(function (e) {    
+        $(".show-full-comment-text").click(function (e) {
             e.preventDefault();
             var target = $(this).attr("href");
             var td = $(this).parent();
@@ -156,9 +156,9 @@
                 }
             });
         });
-    
+
     });
-    
+
     //#JSCOVERAGE_ENDIF
-    
+
 }(jQuery));
diff --git a/plone/app/discussion/browser/migration.py b/plone/app/discussion/browser/migration.py
index 8e478ba..7c55491 100644
--- a/plone/app/discussion/browser/migration.py
+++ b/plone/app/discussion/browser/migration.py
@@ -121,9 +121,10 @@ class View(BrowserView):
                         'action': None,
                         'actor': None,
                         'comment': 'Migrated workflow state',
-                        'review_state': old_status.get(
+                        'review_state': old_status and old_status.get(
                             'review_state',
-                            new_workflow.initial_state),
+                            new_workflow.initial_state)
+                            or 'published',
                         'time': DateTime()
                     }
                     workflow.setStatusOf('comment_review_workflow',
diff --git a/plone/app/discussion/comment.py b/plone/app/discussion/comment.py
index 847b99b..b16101e 100644
--- a/plone/app/discussion/comment.py
+++ b/plone/app/discussion/comment.py
@@ -217,14 +217,9 @@ def notify_content_object(obj, event):
     """Tell the content object when a comment is added
     """
     content_obj = aq_parent(aq_parent(obj))
-    # set the modified date and reindex the item accordingly
-    # so that 304s work correctly. This means that adding a comment
-    # effectively counts as modifying the content type.
-    content_obj.setModificationDate()
     content_obj.reindexObject(idxs=('total_comments',
                                     'last_comment_date',
-                                    'commentators',
-    ))
+                                    'commentators'))
 
 
 def notify_content_object_deleted(obj, event):
diff --git a/plone/app/discussion/tests/functional_test_comments.txt b/plone/app/discussion/tests/functional_test_comments.txt
index 7af4dee..14f3e7c 100644
--- a/plone/app/discussion/tests/functional_test_comments.txt
+++ b/plone/app/discussion/tests/functional_test_comments.txt
@@ -227,7 +227,7 @@ Find a comment id to reply to.
     >>> browser.open(urldoc1)
     >>> import re
     >>> comment_div = re.findall('<div.*?.class="comment.*?>', browser.contents)[0]
-    >>> id = re.findall('"([^"]*)"', comment_div)[2]
+    >>> id = re.findall('"([^"]*)"', comment_div)[1]
 
 Post a reply to an existing comment.