Only use edit overlay if available for editing comments. We will need a plone 5 alternative

CHANGES.rst

@@ -4,7 +4,8 @@ Changelog
 2.4.3 (unreleased)
 ------------------
 
-- Nothing changed yet.
+- Only use edit overlay if available for editing comments
+  [vangheem]
 
 
 2.4.2 (2015-05-04)

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

@@ -189,12 +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>*'
     	});
+    }
 
         /**********************************************************************
          * Delete a comment and its answers.