Set DefaultVirtualenvConfig.venv_config to None when creating the class instance.

Fixes #33

Signed-off-by: Pedro Algarvio <[email protected]>

Author: s0undt3ch

changelog/33.bugfix.rst

@@ -0,0 +1 @@
+Set `DefaultVirtualenvConfig.venv_config` to `None` when creating the class instance.

src/ptscripts/parser.py

@@ -267,14 +267,15 @@ class DefaultVirtualenvConfig:
     """
 
     _instance: DefaultVirtualenvConfig | None = None
-    venv_config: VirtualEnvConfig
+    venv_config: VirtualEnvConfig | None
 
     def __new__(cls):
         """
         Method that instantiates a singleton class and returns it.
         """
         if cls._instance is None:
             instance = super().__new__(cls)
+            instance.venv_config = None
             cls._instance = instance
         return cls._instance