[voice] Changed annotation of getPreferredVoice
method to allow null results
#2186
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VoiceManagerImpl
in 7eb3a9fgetPreferredVoice
method to allow null results in db9a6d9See https://community.openhab.org/t/openhab-3-google-tts/116531
Signed-off-by: Christoph Weitkamp github@christophweitkamp.de