Clean cherry-pick 'Handles the case when getForbiddenPlmns() returns null.'

Bug: 111490801
Test: Manual test
Change-Id: I1dafdbb874468a8de15f7fad6de5a1478592c1ba
Merged-In: I1dafdbb874468a8de15f7fad6de5a1478592c1ba
2 files changed