[Bug 1785854] [NEW] TypeError from confirm CGI.

[Mark Sapiro]

Public bug reported:

We have seen some massive, robotic subscribes and confirmations. In rare
cases a TypeError can be thrown. This occurs because in processing, the
CGI script retrieves the pending entry more than once. If the initial
retrieval returns None, an appropriate message is returned, but if two
clients confirm the same token at the same time, both initial retrievals
may succeed, but then subsequent processing locks the list and retrieves
the data again. The first client to get there processes the confirmation
which removes the token. Then when the list is unlocked, the second
client gets None for the pending data and throws TypeError when
retrieving things from None.

** Affects: mailman
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1785854

Title:
  TypeError from confirm CGI.

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