Fix issue when there is no gns3_controller.conf. Fixes https://github.com/GNS3/gns3-gui/issues/2644

gns3server/controller/__init__.py

@@ -328,6 +328,7 @@ class Controller:
         try:
             if not os.path.exists(self._config_file):
                 await self._import_gns3_gui_conf()
+                self._config_loaded = True
                 self.save()
             with open(self._config_file) as f:
                 controller_settings = json.load(f)