Use Pydantic to validate the server config file.

gns3server/controller/project.py

@@ -413,9 +413,6 @@ class Project:
 
         self._path = path
 
-    def _config(self):
-        return Config.instance().get_section_config("Server")
-
     @property
     def captures_directory(self):
         """
@@ -870,8 +867,8 @@ class Project:
         depending of the operating system
         """
 
-        server_config = Config.instance().get_section_config("Server")
-        path = os.path.expanduser(server_config.get("projects_path", "~/GNS3/projects"))
+        server_config = Config.instance().settings.Server
+        path = os.path.expanduser(server_config.projects_path)
         path = os.path.normpath(path)
         try:
             os.makedirs(path, exist_ok=True)