Fix enum lookup

[cdce8p]

Proposed change

texttospeech.AudioEncoding and texttospeech.SsmlVoiceGender are enums. An index lookup will raise a KeyError.

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[home-assistant]

Hey there @lufton, @tronikos, mind taking a look at this pull request as it has been labeled with an integration (google_cloud) you are listed as a code owner for? Thanks!

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[joostlek]

could it still be None then?

[cdce8p]

if voice is given, it's set to None. So the explicit annotation is necessary here.
encoding will never be set to None though.

core/homeassistant/components/google_cloud/tts.py

Lines 181 to 183 in a1ecefe

	voice = options[CONF_VOICE]
	if voice:
	gender = None