Fix a bug in Helper.addAutofillableIds() that was causing a crash when a view had null autofill id.

Change-Id: I0ce8f4823ad5418ac0a52397583d06f0a0328a2a
Bug: 376371207
Flag: EXEMPT trivial check for null
Test: presubmit
Test: atest CtsAutoFillServiceTestCases
1 file changed