guard docauthor fields. Commit ready to merge.

 - Legacy-Id: 19026

Author: rjsparks

ietf/doc/utils.py

@@ -566,8 +566,8 @@ def _change_field_and_describe(auth, field, newval):
         author_changes = []
         # Now fill in other author details
         author_changes.append(_change_field_and_describe(auth, 'email', docauthor.email))
-        author_changes.append(_change_field_and_describe(auth, 'affiliation', docauthor.affiliation))
-        author_changes.append(_change_field_and_describe(auth, 'country', docauthor.country))
+        author_changes.append(_change_field_and_describe(auth, 'affiliation', docauthor.affiliation or ''))
+        author_changes.append(_change_field_and_describe(auth, 'country', docauthor.country or ''))
         author_changes.append(_change_field_and_describe(auth, 'order', order + 1))
         auth.save()
         log.assertion('auth.email_id != "none"')