Fix missing arguments when saving hyperparams from parent class only

[eladsegal]

What does this PR do?

Fixes #9701

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[codecov]

Codecov Report

Merging #9800 (0d27585) into master (5841ca9) will decrease coverage by 4%.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #9800    +/-   ##
=======================================
- Coverage      93%     89%    -4%     
=======================================
  Files         177     177            
  Lines       15514   15516     +2     
=======================================
- Hits        14373   13753   -620     
- Misses       1141    1763   +622     

[tchaton]

LGTM !