fix: Set default hyper params to empty object instead of none

[dgpatelgit]

Description

There was error while reading old hyper paramters for a ML model as structure and file type are different. Need to handle this in code by setting it to empty dict object instead of none.

Fixes # (issue) https://issues.redhat.com/browse/APPAI-1920

Type of change

Please delete options that are not relevant.

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

[codecov-commenter]

Codecov Report

Merging #172 (bc70c81) into master (b330712) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #172   +/-   ##
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  Coverage   90.24%   90.24%           
=======================================
  Files           4        4           
  Lines         164      164           
=======================================
  Hits          148      148           
  Misses         16       16           

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