Fix issue with controller config saved before checking current version with previous one

gns3server/controller/__init__.py

@@ -191,9 +191,8 @@ class Controller:
         Save the controller configuration on disk
         """
 
-        if self._config_loaded is False:
-            return
-
+        controller_settings = dict()
+        if self._config_loaded:
             controller_settings = {"computes": [],
                                    "templates": [],
                                    "gns3vm": self.gns3vm.__json__(),
@@ -229,8 +228,7 @@ class Controller:
 
         try:
             if not os.path.exists(self._config_file):
-                self._config_loaded = True
-                self.save()
+                self.save()  # this will create the config file
             with open(self._config_file) as f:
                 controller_settings = json.load(f)
         except (OSError, ValueError) as e: