prevent TB when reading pending events. Fixes #4035

src/gajim.py

@@ -2117,6 +2117,8 @@ class Interface:
 			event = gajim.events.get_first_event(account, fjid, type_)
 			if not event:
 				event = gajim.events.get_first_event(account, jid, type_)
+			if not event:
+				return
 
 			if type_ == 'printed_chat':
 				ctrl = event.parameters[0]