[CLI] Avoid warning when configure_optimizers will not be overridden

[carmocca]

What does this PR do?

See added test
Part of #9565

Does your PR introduce any breaking changes? If yes, please list them.

None

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• Did you write any new necessary tests? (not for typos and docs)
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• [n/a] Did you update the CHANGELOG? (not for typos, docs, test updates, or internal minor changes/refactorings)

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[codecov]

Codecov Report

Merging #9583 (7916e24) into master (856ed10) will decrease coverage by 0%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #9583    +/-   ##
=======================================
- Coverage      93%     93%    -0%     
=======================================
  Files         181     182     +1     
  Lines       15295   15412   +117     
=======================================
+ Hits        14211   14303    +92     
- Misses       1084    1109    +25     

[tchaton]

Good catch !