Fix media renderers without volume control

[ocampana]

This is the solution proposed by #apfelmaennchen in issue 30395

Breaking change

No breaking change

Proposed change

This is necessary for DLNA renderers that do not export volume control. Without this change, those devices appear as broken in the UI.

Type of change

• Dependency upgrade
• [* ] Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example entry for configuration.yaml:

# Example configuration.yaml
media_player:
  - platform: dlna_dmr
    name: Sony SA-NS410
    url: http://192.168.30.96:8000/serverxml.xml

Additional information

• This PR fixes or closes issue: fixes DLNA_DMR: Error doing job: Task exception was never retrieved (Missing StateVariable RC/Volume) #30395
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• [* ] The code change is tested and works locally.
• [* ] Local tests pass. Your PR cannot be merged unless tests pass
• [ *] There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

The integration reached or maintains the following Integration Quality Scale:

• No score or internal
• 🥈 Silver
• 🥇 Gold
• 🏆 Platinum

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[homeassistant]

Hi @ocampana,

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.

Thanks!

[balloob]

Looks good. Have you tested this locally?

[ocampana]

@balloob I have this change running on my installation of home assistant at home and it works.

[frenck]

Thanks, @ocampana 👍