Various flake8 fixes.

- Removed tabs.
- Fixed E731 do not assign a lambda expression, use a def.
- avoid hasattr

plone/app/discussion/browser/comments.pt

@@ -37,8 +37,8 @@
                              author_home_url python:view.get_commenter_home_url(username=reply.author_username);
                              has_author_link python:author_home_url and not isAnon;
                              portrait_url python:view.get_commenter_portrait(reply.author_username);
-			     review_state python:wtool.getInfoFor(reply, 'review_state', 'none');
-			     canEdit python:view.can_edit(reply);
+                             review_state python:wtool.getInfoFor(reply, 'review_state', 'none');
+                             canEdit python:view.can_edit(reply);
                              canDelete python:view.can_delete(reply)"
                  tal:attributes="class python:'comment replyTreeLevel'+str(depth)+' state-'+str(review_state);
                                  id string:${reply/getId}"
@@ -92,9 +92,9 @@
                               action=""
                               method="post"
                               class="commentactionsform"
-		                      tal:condition="python:not canDelete and isDeleteOwnCommentAllowed and view.could_delete_own(reply)"
+                              tal:condition="python:not canDelete and isDeleteOwnCommentAllowed and view.could_delete_own(reply)"
                               tal:attributes="action string:${reply/absolute_url}/@@delete-own-comment;
-			                      style python:view.can_delete_own(reply) and 'display: inline' or 'display: none'">
+                                              style python:view.can_delete_own(reply) and 'display: inline' or 'display: none'">
                             <input name="form.button.DeleteComment"
                                    class="destructive"
                                    type="submit"

plone/app/discussion/browser/conversation.py

@@ -8,6 +8,7 @@ from Products.CMFCore.interfaces import IFolderish
 from Products.CMFCore.utils import getToolByName
 from Products.CMFPlone.interfaces import INonStructuralFolder
 from Products.CMFPlone.interfaces import IPloneSiteRoot
+from Products.CMFPlone.utils import safe_hasattr
 from zope.component import queryUtility
 
 
@@ -132,7 +133,7 @@ class ConversationView(object):
             return False
 
         # Check if discussion is allowed on the content object
-        if hasattr(context, 'allow_discussion'):
+        if safe_hasattr(context, 'allow_discussion'):
             if context.allow_discussion is not None:
                 return context.allow_discussion
 

plone/app/discussion/browser/javascripts/comments.js

@@ -189,14 +189,14 @@ require([  // jshint ignore:line
         /**********************************************************************
          * Edit a comment
          **********************************************************************/
-    if($.fn.prepOverlay){
-    	$('form[name="edit"]').prepOverlay({
-            cssclass: 'overlay-edit-comment',
-            width: '60%',
-    		subtype: 'ajax',
-    		filter: '#content>*'
-    	});
-    }
+        if($.fn.prepOverlay){
+            $('form[name="edit"]').prepOverlay({
+                cssclass: 'overlay-edit-comment',
+                width: '60%',
+                subtype: 'ajax',
+                filter: '#content>*'
+            });
+        }
 
         /**********************************************************************
          * Delete a comment and its answers.