modules/gnome: fix genmarshall install_dir default
Which needs to be converted from None to an empty list
@@ -1758,7 +1758,7 @@ class GnomeModule(ExtensionModule):
cmd.append(f'--{k.replace("_", "-")}')
install_header = kwargs['install_header']
- install_dir = kwargs['install_dir']
+ install_dir: T.List[T.Union[str, bool]] = kwargs['install_dir'] or []
custom_kwargs: T.Dict[str, T.Any] = {
