Fixes 6996 - Also fix -c when -t is not present

hgreview.py

 import BaseHTTPServer
 import os
 import re
 import socket
 import sys
 import urllib
 
 from mercurial import cmdutil, error
 
 SERVER = 'https://codereview.adblockplus.org'
@@ skipping 49 matching lines @@
     else:
         raise error.Abort('What should be reviewed? Either --revision or --change is required.')
 
     if not opts.get('issue'):
         # New issue, make sure title and message are set
         fulltitle = None
 
         if not opts.get('title') and not opts.get('change'):
             opts['title'] = ui.prompt('New review title: ', '')
         elif not opts.get('title'):
-            fulltitle = repo[opts['change']].description()
+            rev_no = repo.revs(opts['change']).first()
+            fulltitle = repo[rev_no].description()
             opts['title'] = fulltitle.rstrip().split('\n')[0]
 
         if not opts['title'].strip():
             raise error.Abort('No review title given.')
 
         if not opts.get('message'):
             opts['message'] = fulltitle or opts['title']
 
         path = (ui.config('paths', 'default-push')
                 or ui.config('paths', 'default')
@@ skipping 83 matching lines @@
   </body>
 </html>
 ''' % port
 
     # Run the upload tool
     issue, patchset = scope['RealMain']([upload_path] + args)
 
     # Wait for the page to check in and retrieve issue URL
     if server:
         server.handle_request()