The server does not return an item-not-found error when requesting to delete a non-existing offline message.
reported in http://www.igniterealtime.org/forum/thread.jspa?threadID=26604
"when sending this query: "<iq type='set' id='remove1'><offline xmlns='http://jabber.org/protocol/offline'>
<item action='remove' node='2003-02-27T22:52:37.225Z'/></offline></iq>", as given for example in XEP-0013, I get a "<iq type="result" id="remove1" to="kund2@vbyhosa/Exodus"/>" answer.
No node with that name exists, so I should get a "If the requester is authorized but the node does not exist, the server MUST return a <item-not-found/> error."."
Removing the 'fix version' for all unresolved issues that were scheduled for version 7.8.2. We're releasing this version today - the remaining issues should be rescheduled later.