modules/gnome: remove unnecessary type check
This should have been removed when typed_kwargs was added
@@ -1630,9 +1630,6 @@ class GnomeModule(ExtensionModule):
if kwargs['docbook'] is not None:
docbook = kwargs['docbook']
- if not isinstance(docbook, str):
- raise MesonException('docbook value must be a string.')
-
# The docbook output is always ${docbook}-${name_of_xml_file}
output = namebase + '-docbook'
outputs = []
