Handle command_line missing discovery_info

[yarikoptic]

Proposed change

Just make code more "correct" as signature allows for None but then code assumes that it is a DiscoveryInfoType. In this case also in case of an empty constract or none - just return with a warning (since I guess it is unexpected)

Type of change

• [ ] Dependency upgrade

• [x] 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

• This PR fixes or closes issue: fixes #116871

Checklist

• [ ] The code change is tested and works locally.
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[home-assistant[bot]]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks :+1:

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[home-assistant[bot]]

Hey there @gjohansson-st, mind taking a look at this pull request as it has been labeled with an integration (command_line) you are listed as a code owner for? Thanks!

Code owner commands

Code owners of `command_line` can trigger bot actions by commenting: - `@home-assistant close` Closes the pull request. - `@home-assistant rename Awesome new title` Renames the pull request. - `@home-assistant reopen` Reopen the pull request. - `@home-assistant unassign command_line` Removes the current integration label and assignees on the pull request, add the integration domain after the command. - `@home-assistant add-label needs-more-information` Add a label (needs-more-information, problem in dependency, problem in custom component) to the pull request. - `@home-assistant remove-label needs-more-information` Remove a label (needs-more-information, problem in dependency, problem in custom component) on the pull request.