plugin XEP-0384: wait for client to be ready if session is missing when onNewDevices is called

sat/plugins/plugin_xep_0384.py

@@ -539,6 +539,8 @@ class OMEMO(object):
 
     @defer.inlineCallbacks
     def profileConnected(self, client):
+        # FIXME: is _xep_0384_ready needed? can we use profileConnecting?
+        #        Workflow should be checked
         client._xep_0384_ready = defer.Deferred()
         # we first need to get devices ids (including our own)
         persistent_dict = persistent.LazyPersistentBinaryDict("XEP-0384", client.profile)
@@ -767,7 +769,11 @@ class OMEMO(object):
     @defer.inlineCallbacks
     def onNewDevices(self, itemsEvent, profile):
         client = self.host.getClient(profile)
-        omemo_session = client._xep_0384_session
+        try:
+            omemo_session = client._xep_0384_session
+        except AttributeError:
+            yield client._xep_0384_ready
+            omemo_session = client._xep_0384_session
         entity = itemsEvent.sender
 
         devices = self.parseDevices(itemsEvent.items)