Add initial _author_info. See ietf-tools#626

 - Legacy-Id: 2899

Author: emiliosanchez

ietf/utils/draft.py

@@ -131,6 +131,7 @@ def __init__(self, text):
         self.filename, self.revision = self._parse_draftname()
 
         self._authors = None
+        self._author_info = None
         self._abstract = None
         self._pagecount = None
         self._status = None