Improve volume support for Vizio Smartcast (#14981)
Improve volume support for Vizio Smartcast (#14981)

* Improve volume support for Vizio Smartcast

* Vizio: avoid an error when 'self._device.get_current_volume()' returns 'None'

* Improve volume support for Vizio Smartcast

* Vizio: avoid an error when 'self._device.get_current_volume()' returns 'None'

* First line should end with a period

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