asciidoc_reader: Don't add empty metadata values
@@ -51,6 +51,8 @@ class AsciiDocReader(BaseReader):
metadata = {}
for name, value in ad.asciidoc.document.attributes.items():
+ if value is None:
+ continue
name = name.lower()
metadata[name] = self.process_metadata(name, six.text_type(value))
if 'doctitle' in metadata: