Suppress the "... - nothing changed" status banner presented when a

form is submitted. This is triggered only when only quiet properties
are changed.

See:

 https://sourceforge.net/p/roundup/mailman/roundup-users/thread/20170421012107.E
040180690%40vm71.cs.umb.edu/

with subject:
 [Roundup-users] Does anybody think feedback saying "nothing changed" is useful?

Author: rouilj

roundup/cgi/actions.py

@@ -634,8 +634,13 @@ def _editnodes(self, all_props, all_links):
                             self._('%(class)s %(id)s %(properties)s edited ok')
                             % {'class':cn, 'id':nodeid, 'properties':info})
                     else:
-                        m.append(self._('%(class)s %(id)s - nothing changed')
-                            % {'class':cn, 'id':nodeid})
+                        # this used to produce a message like:
+                        #    issue34 - nothing changed
+                        # which is confusing if only quiet properties
+                        # changed for the class/id. So don't report
+                        # anything is the user didn't explicitly change
+                        # a visible (non-quiet) property.
+                        pass
                 else:
                     assert props