state: allow unused optional storage to be removed #5862
Merged
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When switching/upgrading the charm for an application,
we have been too strict when stores are removed from
the charm metadata. If a store is marked optional,
and is unused, its removal should not trigger failure.
QA:
(which was reverted due to this bug)
There should be no errors.
Fixes https://bugs.launchpad.net/juju-core/+bug/1599503
(Review request: http://reviews.vapour.ws/r/5299/)