Added a check to prevent blank messages from being posted.

mediagoblin/user_pages/views.py

@@ -133,9 +133,14 @@ def media_post_comment(request):
     comment['media_entry'] = ObjectId(request.matchdict['media'])
     comment['author'] = request.user['_id']
     comment['content'] = unicode(request.POST['comment_content'])
-
     comment['content_html'] = cleaned_markdown_conversion(comment['content'])
 
+    if not comment['content'].strip():
+        messages.add_message(
+            request,
+            messages.ERROR,
+            _("Empty comments are not allowed."))
+    else:
         comment.save()
 
         messages.add_message(