Bugfix: Ensure each transformation function argument has an input

[aolfat]

Description

Type of change

Does this correspond to an open issue?

Select type(s) of change

• 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)
• Documentation update

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have fixed any merge conflicts

[codecov]

Codecov Report

Merging #1018 (b3dbe6b) into main (2a2eea6) will increase coverage by 0.65%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##             main    #1018      +/-   ##
==========================================
+ Coverage   47.75%   48.41%   +0.65%     
==========================================
  Files         110      110              
  Lines       20853    20855       +2     
==========================================
+ Hits         9959    10097     +138     
+ Misses      10212    10069     -143     
- Partials      682      689       +7     

Files	Coverage Δ
client/src/featureform/register.py	65.28% <60.00%> (-0.03%)	⬇️

... and 4 files with indirect coverage changes

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