Fix NPE in TTS service if no engine string
Test: added test in TextToSpeechServiceTest Bug: 232438498 (cherry picked from https://googleplex-android-review.googlesource.com/q/commit:e5364f93d3208a66d599d7256d2e4cfaba989e0e) Merged-In: Ia587d34e2898930c0956024c56a1f19debb445e4 Change-Id: Ia587d34e2898930c0956024c56a1f19debb445e4
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