[Bug 1390653] [NEW] If a user is unsubscribed after retrieving her options page and before submitting an unsub, an uncaught exception is thrown

[Mark Sapiro]

Public bug reported:

Scenario 1:

User logs in and retrieve her options page.
Another process unsubscribes the user.
User submits an unsub from the options page.
NotAMemberError is thrown and not caught.

Scenario 2

User logs in and retrieve her options page.
User unsubscribes.
User goes back a page in her browser and unsubscribes again.
NotAMemberError is thrown and not caught.

The options CGI should catch and ignore NotAMemberError.

** Affects: mailman
     Importance: Low
     Assignee: Mark Sapiro (msapiro)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1390653

Title:
  If a user is unsubscribed after retrieving her options page and before
  submitting an unsub, an uncaught exception is thrown

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