Catch NPE for AllAppsContainerView.dispatchRestoreInstanceState

TL;DR;;
Missing view id for work profile recycler view
caused restore failure as there are different type of
views that contains same id. However, even after that fix,
lack of view id in slice views generated by other process
causes failure when mFlags on these not restored slice
views needs to be accessed.

Bug: 186596139
Test: manual
Change-Id: I8a97598c27acbc05ac8a39c50fe5862e541d62ad