Update JSON config file if it lacks keys

src/python/config_files.py

@@ -65,6 +65,10 @@ class JSONConfigFile(ConfigFile):
 
         all_data = await self.default_data()
         dict_update_recursive(all_data, data)
+
+        if len(data) != len(all_data):
+            await self.write(all_data)
+
         return all_data