Adds null check before applyPostResolutionFilter

Calls to mComponentResolver.query* may return null. This change
appropriately annotates those methods and does checks before passing the
results on to applyPostResolutionFilter (which has also been annotated).

Test: atest DeviceOwnerPlusProfileOwnerTest.testWipeData_managedProfile
Fixes: 142311634
Change-Id: I911041c87964a117f60a71d0957d42f16a7ab8cb