quick_frontend, primitivus: various fixes (MUC and cached signals):

- actually call the cached signals, everything was there but the call was not done
    - display '[]' instead of '[None]' when group message coming from the room (no resource)
    - catch the exception when trying to delete an occupant who's not in the room
    - do not cache a "main resource" for MUC entities

frontends/src/quick_frontend/quick_app.py

@@ -388,6 +388,7 @@ class QuickApp(object):
         cached_signals = self.signals_cache.pop(profile, [])
         for function_name, handler, args, kwargs in cached_signals:
             log.debug(u"Calling cached signal [%s] with args %s and kwargs %s" % (function_name, args, kwargs))
+            handler(*args, **kwargs)
 
         self.callListeners('profilePlugged', profile=profile)
 

frontends/src/quick_frontend/quick_contact_list.py

@@ -296,6 +296,7 @@ class QuickContactList(QuickWidget):
                 self._specials.remove(entity_bare)
             else:
                 self._specials.add(entity_bare)
+                cache[C.CONTACT_MAIN_RESOURCE] = None
 
         # now the attribute we keep in cache
         for attribute, value in attributes.iteritems():
@@ -401,8 +402,9 @@ class QuickContactList(QuickWidget):
             resource_data[C.PRESENCE_PRIORITY] = int(priority)
             resource_data[C.PRESENCE_STATUSES] = statuses
 
-            priority_resource = max(resources_data, key=lambda res: resources_data[res][C.PRESENCE_PRIORITY])
-            cache[C.CONTACT_MAIN_RESOURCE] = priority_resource
+            if entity.bare not in self._specials:
+                priority_resource = max(resources_data, key=lambda res: resources_data[res][C.PRESENCE_PRIORITY])
+                cache[C.CONTACT_MAIN_RESOURCE] = priority_resource
         self.update()
 
     def onNickUpdate(self, entity, new_nick, profile):