lib-storage: Implemented get_metadata() for fail-mailbox. This fixes a crash when a nonexistent mailbox was allocated and accessed (via LAYOUT=index).
lib-storage: Implemented get_metadata() for fail-mailbox.
This fixes a crash when a nonexistent mailbox was allocated and accessed
(via LAYOUT=index).

jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch