[BUG-FIX] WandbLogger _sanitize_callable

[tchaton]

What does this PR do?

The PR fixes an issue introduced with WandbLogger.

Fixes #4380

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[pep8speaks]

Hello @tchaton! Thanks for updating this PR.

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2020-11-02 08:00:17 UTC

[codecov]

Codecov Report

Merging #4422 into master will decrease coverage by 0%.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #4422   +/-   ##
======================================
- Coverage      93%     93%   -0%     
======================================
  Files         113     113           
  Lines        8192    8192           
======================================
- Hits         7624    7621    -3     
- Misses        568     571    +3