plugin XEP-0060: free SatPubSubClient instance on profile disconnection

src/plugins/plugin_xep_0060.py

@@ -65,6 +65,12 @@ class XEP_0060(object):
         self.clients[profile] = SatPubSubClient(self.host, self)
         return self.clients[profile]
 
+    def profileDisconnected(self, profile):
+        try:
+            del self.clients[profile]
+        except KeyError:
+            pass
+
     def addManagedNode(self, node_name, callback):
         """Add a handler for a namespace
         @param namespace: NS of the handler (will appear in disco info)