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Check if the map is destroyed before saving state in a fragment #12804
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Fixes #12803.
In a
ViewPagersetup, once created fragment doesn't need to be detached when its view is destroyed, meaning, that the out-of-view fragment is re-attached on orientation change but its view is not created, therefore theMapViewis null. Also, when the fragment is attached, theonSaveInstanceStatewill be called resulting in theNPE.