Fixed openhome metadata issue

[bazwilliams]

Description:

A change in the openhomedevice library now means some metadata might not be present when requesting track information. I forgot to defend against this and as a result when the metadata is not present an key exception is thrown.

This also stops devices from being registered on discovery due to the call of 'update' when adding.

Related issue (if applicable): fixes #7926

Checklist:

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

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• New dependencies have been added to the REQUIREMENTS variable ([example][ex-requir]).
• New dependencies are only imported inside functions that use them ([example][ex-import]).
• New dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• New files were added to .coveragerc.

[mention-bot]

@bazwilliams, thanks for your PR! By analyzing the history of the files in this pull request, we identified @balloob and @fabaff to be potential reviewers.

[houndci-bot]

line too long (85 > 79 characters)

[houndci-bot]

continuation line with same indent as next logical line

[pvizeli]

instead this 2 lines use:

return self._track_information.get('albumArtwork')

Change also the quote to single. Make sure that the update() make a empty dict if no data are available and set that also on init.

[balloob]

Cherry-picked for 0.46.1