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

[Mark Sapiro]

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.

[Mark Sapiro (msapiro)]

Actually, this bug is much less likely to occur than the description indicates because the second unsub attempt will only throw the exception if the user has a list admin authentication cookie. If the user had originally authenticated only as the user, the second attempt will fail for lack of authentication.

But I fixed it anyway before realizing this.