exit40 to indicate absence of initialisation

src/mpsd_software_manager/mpsd_software.py

@@ -1162,7 +1162,7 @@ def get_root_dir() -> Path:
         + f"and the hidden file `{config_vars['init_file']}`."
         " to check if a directory is initialised"
     )
-    sys.exit(1)
+    sys.exit(40)
 
 
 def main():