[Merge] lp:~abompard/mailman/bug-1170347 into lp:mailman

Aurélien Bompard has proposed merging lp:~abompard/mailman/bug-1170347 into lp:mailman. Requested reviews: Mailman Coders (mailman-coders) For more details, see: https://code.launchpad.net/~abompard/mailman/bug-1170347/+merge/242761 Fix digest handler crash reported in bug #1170347. -- Your team Mailman Coders is requested to review the proposed merge of lp:~abompard/mailman/bug-1170347 into lp:mailman.