we never catch MUC errors with last refactoring
\<presence to="gajim@conference.jabber.no/nkour" from="nkour@jabber.org/Gajim" id="56">\<x xmlns="http://jabber.org/protocol/muc" />\</presence>
\<presence from='gajim@conference.jabber.no/nkour' id='56' to='nkour@jabber.org/Gajim' type='error'>\<x xmlns='http://jabber.org/protocol/muc'/>\<error code='409' type='cancel'>\<conflict xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>\<text xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'>Nickname is already in use by another occupant\</text>\</error>\</presence>
and we print
[01:07:57] Error conflict: gajim@conference.jabber.no
where it should have been a happy UI