Handle alexa invalid climate temp adjustment

[jbouwh]

Proposed change

In cases where a climate entity has not set the target temperature attribute.
Attempts adjust the target temperarture are not supported and should be handled properly.

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)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #Uncaught exception processing Alexa #99702
• 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.
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• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

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

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[home-assistant]

Hey there @home-assistant/cloud, @ochlocracy, mind taking a look at this pull request as it has been labeled with an integration (alexa) you are listed as a code owner for? Thanks!

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[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[edenhaus]

Thanks @jbouwh 👍

[jbouwh]

Thnx!