Fixed motion projector if comment field is None. Fixed #2614.

openslides/motions/access_permissions.py

@@ -47,6 +47,7 @@ class MotionAccessPermissions(BaseAccessPermissions):
         for the projector. Removes several fields.
         """
         data = full_data.copy()
+        if data.get('comments') is not None:
             for i, field in enumerate(config['motions_comments']):
                 if not field.get('public'):
                     try: