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LexemeResult: guard against mTitle being null

Authored by Daimona on Oct 7 2019, 11:14 AM.

Description

LexemeResult: guard against mTitle being null

This is also needed to unbreak PHPUnit for this repo. Checking for null
seems the best option, according to the comment which says that this
code is emulating FormTitleStoreLookup.

Bug: T233763
Change-Id: Ice76a636618a5f8c02f6a13726fbb5955970c950