check if file_name is present in package obj (#772)

fedn/network/api/interface.py

@@ -276,7 +276,7 @@ def get_compute_package(self):
         :rtype: :class:`flask.Response`
         """
         result = self.statestore.get_compute_package()
-        if result is None:
+        if result is None or "file_name" not in result:
             return (
                 jsonify({"success": False, "message": "No compute package found."}),
                 404,