[Bug 1425359] [NEW] 500 error code shown by postorius instead of 409 error code

[Ankush Sharma]

Public bug reported:

When a new mailman subscriber is created with the email of an already
existing mailman subscriber or user a `409` code with a message `user
already exists` is returned by the postorius but when the same email but
now case sensitive is used a `500` code with message `server error code`
is returned.

The latter should also return a `409` instead of `500` as it is
misleading.

Although the mailman core is giving `AssertionError: User should have
had linked address` in both the cases`.

** Affects: mailman
     Importance: Undecided
         Status: New


** Tags: mailman3

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https://bugs.launchpad.net/bugs/1425359

Title:
  500 error code shown by postorius instead of 409 error code

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