comments: avoid storing 'No comments' text when changing status

When a general comment (with or without status change) is added to a
changeset or pull request, and no text was added, Kallithea automatically
used 'No comments' as text. The stub text is added to the database as if it has
been entered by the user and it can thus not easily be identified as an
automatic comment.

This commit makes following changes:
- allow adding an empty comment to the database when there is a status
  change. An empty comment without status change is ignored.
- do not add a stub text to the database, but generate it on demand
- the stub text is shown in italic font to differentiate it from user-entered
  text

Currently there is a large amount of duplication between
controllers/changeset.py and controllers/pullrequests.py, which is to be
cleaned up in a later commit.

kallithea/controllers/changeset.py

@@ -349,7 +349,7 b' class ChangesetController(BaseRepoContro'
     @jsonify
     def comment(self, repo_name, revision):
         status = request.POST.get('changeset_status')
-        text = request.POST.get('text', '').strip() or _('No comments.')
+        text = request.POST.get('text', '').strip()
 
         c.co = comm = ChangesetCommentsModel().create(
             text=text,

kallithea/controllers/pullrequests.py

@@ -696,7 +696,7 b' class PullrequestsController(BaseRepoCon'
         if allowed_to_change_status:
             status = request.POST.get('changeset_status')
             close_pr = request.POST.get('save_close')
-        text = request.POST.get('text', '').strip() or _('No comments.')
+        text = request.POST.get('text', '').strip()
         if close_pr:
             text = _('Closing.') + '\n' + text
 

kallithea/model/comment.py

@@ -182,7 +182,7 b' class ChangesetCommentsModel(BaseModel):'
         :param closing_pr: (for emails, not for comments)
         :param send_email: also send email
         """
-        if not text:
+        if not status_change and not text:
             log.warning('Missing text for comment, skipping...')
             return
 

kallithea/public/css/style.css

@@ -4347,6 +4347,10 b' div.rst-block pre {'
     font-size: 16px;
 }
 
+.automatic-comment {
+    font-style: italic;
+}
+
 /** comment form **/
 
 .status-block {

kallithea/templates/changeset/changeset_file_comment.html

@@ -51,7 +51,13 b''
       %endif
       </div>
       <div class="text">
+        %if co.text:
           ${h.rst_w_mentions(co.text)|n}
+        %else:
+          <div class="rst-block automatic-comment">
+            <p>${_('No comments.')}</p>
+          </div>
+        %endif
       </div>
     </div>
   </div>