Avoid to read env file if it is not a file

backend/cli.py

@@ -170,7 +170,7 @@ def main():
 
     # Dispatch handler.
     args = parser.parse_args()
-    if hasattr(args, "env_file"):
+    if hasattr(args, "env_file") and Path(args.env_file).is_file():
         env.read_env(args.env_file, recurse=False, override=True)
     if hasattr(args, "handler"):
         django.setup()