Fix error in tibber while fetching latest statistics

[tronikos]

Proposed change

Fix exception in beta caused by #92095
{} is dict but the function expects a set so change it to set()

Error is:
'dict' object has no attribute 'discard'

Note I don't use tibber. I only noticed it because my opower integration #90489 that has the same function call encountered this exception

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 #
• 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
• I have followed the perfect PR recommendations
• 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.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
• Untested files have been added to .coveragerc.

To help with the load of incoming pull requests:

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

[home-assistant]

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

Code owner commands

Code owners of tibber 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 tibber Removes the current integration label and assignees on the pull request, add the integration domain after the command.

[tronikos]

@bdraco For backwards compatibility you might want to allow the types in _extract_metadata_and_discard_impossible_columns function to be empty dict.

[bdraco]

Traveling today but will look at this when I get through security

[bdraco]

Looks like this came in via #82131

I missed it in review.

It is typed correctly.

Not sure why mypy didn't catch it

[bdraco]

Thanks @tronikos

I didn't add bug for bug backwards compatibility here since the typing is correct and it blows up with a rather obvious error so I don't think we will have bugs hiding out for long if someone also has made it an empty dict