fix/race condition dictionary changed iteration

bus events could cause the dict to change while being iterated

mycroft/client/enclosure/base.py

@@ -265,7 +265,7 @@ def __insert_new_namespace(self, namespace, pages):
 
         # Load any already stored Data
         data = self.datastore.get(namespace, {})
-        for key in data:
+        for key in dict(data):
             msg = {"type": "mycroft.session.set",
                    "namespace": namespace,
                    "data": {key: data[key]}}