[dovecot/core] d52825: virtual: Avoid assert-crash if backend mailbox's h...

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: d5282594ec73c953ffb23096a2cddf373cc15f46
      https://github.com/dovecot/core/commit/d5282594ec73c953ffb23096a2cddf373cc15f46
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2017-07-06 (Thu, 06 Jul 2017)

  Changed paths:
    M src/plugins/virtual/virtual-storage.c

  Log Message:
  -----------
  virtual: Avoid assert-crash if backend mailbox's have_guid lookup fails

The MAIL_ERROR_NOTFOUND can happen if the mailbox was already deleted.
Other errors aren't expected to happen and possibly point to a bug.

Fixes:
Panic: file mail-storage.c: line 1831: unreached