Return an early error if we can't extract enough information from the draft to fill in the metainformation that lets the user return to this submission later. Tweak an error message.

 - Legacy-Id: 3171

Author: levkowetz

ietf/submit/parsers/plain_parser.py

@@ -59,10 +59,12 @@ def parse_filename(self):
             match_revision = revisionre.match(filename)
             if match_revision:
                 self.parsed_info.metadraft.revision = match_revision.group(1)
+            else:
+                self.parsed_info.add_error(u'The filename found on the first page of the document does not contain a revision: "%s"' % (filename,))
             filename = re.sub('-\d+$', '', filename)
             self.parsed_info.metadraft.filename = filename
             return
-        self.parsed_info.add_error('The document does not contain a legitimate filename that start with draft-*')
+        self.parsed_info.add_error('The first page of the document does not contain a legitimate filename that start with draft-*')
 
     def parse_wg(self):
         filename = self.parsed_info.metadraft.filename