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PrefixSearch: Avoid passing non-strings to Title::newFromText()

Description

PrefixSearch: Avoid passing non-strings to Title::newFromText()

We already handle the invalid title gracefully here anyway, so
just rely on that behavior and just skip the Title construction
bit :)

Bug: T109975
Change-Id: I0dc3d91b6b4cfb97664aa6ca39c5c8f086d70db5