Handle NPE when grid tool is open and map is removed #4754
Merged
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Identify the Bug or Feature request
Fixes #4523
Description of the Change
When the Adjust Grid tool is detached from a zone, it first attempts to write out its state to the zone. This doesn't work if the zone is being removed since the zone is likely to be gone by the time the updated is received. So we now check in the message handlers whether the zone is still around before applying the updates.
Possible Drawbacks
Should be none
Documentation Notes
N/A
Release Notes
This change is![Reviewable](https://camo.githubusercontent.com/1541c4039185914e83657d3683ec25920c672c6c5c7ab4240ee7bff601adec0b/68747470733a2f2f72657669657761626c652e696f2f7265766965775f627574746f6e2e737667)