[Bug 897103] [NEW] Crash when moderating messages with empty sender address

[Bernd Wurst]

Public bug reported:

A message in the moderation queue has had an empty sender address
("From: foobar <>").

This leads to the folowing traceback:
admin(9230): [----- Mailman Version: 2.1.14 -----] 
admin(9230): [----- Traceback ------] 
admin(9230): Traceback (most recent call last):
admin(9230):   File "/home/.internal/mailman/scripts/driver", line 112, in run_main
admin(9230):     main()
admin(9230):   File "/home/.internal/mailman/Mailman/Cgi/admindb.py", line 167, in main
admin(9230):     process_form(mlist, doc, cgidata)
admin(9230):   File "/home/.internal/mailman/Mailman/Cgi/admindb.py", line 718, in process_form
admin(9230):     if id not in senderactions[sender]['message_ids']:
admin(9230): KeyError: 'message_ids'

** Affects: mailman
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/897103

Title:
  Crash when moderating messages with empty sender address

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