Remove warning

[justusschock]

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?
• If you made a notable change (that affects users), did you update the CHANGELOG?

What does this PR do?

as discussed in #1631.

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

[Borda]

this was quite a useless warning as it was raised with a normal run and this change was written in the changelog

[codecov]

Codecov Report

Merging #1634 into master will decrease coverage by 0%.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1634   +/-   ##
======================================
- Coverage      89%     89%   -0%     
======================================
  Files          71      71           
  Lines        4164    4163    -1     
======================================
- Hits         3689    3688    -1     
  Misses        475     475           

[awaelchli]

I actually didn't think of this when I made the progress bar callback. Was the intention that we make this change manually when we get to 0.8?