Last modified: 2013-04-22 16:15:44 UTC
Before the ContentHandler merge, using action=edit&appendtext=... on a non-existent page would treat the page as if it existed but had no content. After the merge, it throws an error incorrectly claiming that appending is not supported for wikitext.
Gerrit patchset #27441
I believe that would be Gerrit change #27441 (I hope this will link correctly).
Should get in for Monday.
Changeset is merged.