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Volumio Integration - TTS broken

See original GitHub issue

The problem

Invoking the TTS function of the Volumio Lovelace Card produces the following error:

Failed to call service tts/google_translate_say. Expecting value: line 1 column 1 (char 0)

All other functions of the Volumio Card seem to work correctly (although there are some display issues with the prev/next buttons).

Environment

Home Assistant Core release with the issue: 2021.1.4
Last working Home Assistant Core release (if known): Unknown
Operating environment (OS/Container/Supervised/Core): Home Assistant OS 5.10
Integration causing this issue: Volumio
Link to integration documentation on our website: https://www.home-assistant.io/integrations/volumio/

Problem-relevant `configuration.yaml`

# Text to speech
tts:
  - platform: google_translate

Traceback/Error logs

Logger: homeassistant.components.websocket_api.http.connection
Source: components/volumio/media_player.py:256
Integration: Home Assistant WebSocket API (documentation, issues)
First occurred: 14:34:13 (1 occurrences)
Last logged: 14:34:13

[2905393976] Expecting value: line 1 column 1 (char 0)
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/websocket_api/commands.py", line 135, in handle_call_service
    await hass.services.async_call(
  File "/usr/src/homeassistant/homeassistant/core.py", line 1445, in async_call
    task.result()
  File "/usr/src/homeassistant/homeassistant/core.py", line 1480, in _execute_service
    await handler.job.target(service_call)
  File "/usr/src/homeassistant/homeassistant/components/tts/__init__.py", line 181, in async_say_handle
    await hass.services.async_call(
  File "/usr/src/homeassistant/homeassistant/core.py", line 1445, in async_call
    task.result()
  File "/usr/src/homeassistant/homeassistant/core.py", line 1480, in _execute_service
    await handler.job.target(service_call)
  File "/usr/src/homeassistant/homeassistant/helpers/entity_component.py", line 204, in handle_service
    await self.hass.helpers.service.entity_service_call(
  File "/usr/src/homeassistant/homeassistant/helpers/service.py", line 593, in entity_service_call
    future.result()  # pop exception if have
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 664, in async_request_call
    await coro
  File "/usr/src/homeassistant/homeassistant/helpers/service.py", line 630, in _handle_entity_call
    await result
  File "/usr/src/homeassistant/homeassistant/components/volumio/media_player.py", line 256, in async_play_media
    await self._volumio.replace_and_play(json.loads(media_id))
  File "/usr/local/lib/python3.8/json/__init__.py", line 357, in loads
    return _default_decoder.decode(s)
  File "/usr/local/lib/python3.8/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/local/lib/python3.8/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)