fix: set inputs as optional

[aniketmaurya]

What does this PR do?

categorical_inputs and numerical_inputs are made optional. The error will raise only when both are None.
Fixes #108

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[codecov]

Codecov Report

Merging #109 (8d03c0d) into master (a4952da) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #109      +/-   ##
==========================================
+ Coverage   86.34%   86.38%   +0.03%     
==========================================
  Files          47       47              
  Lines        1509     1513       +4     
==========================================
+ Hits         1303     1307       +4     
  Misses        206      206              

Flag	Coverage Δ
unittests	86.38% <100.00%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
flash/tabular/classification/data/data.py	85.39% <100.00%> (+0.68%)	⬆️

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[kaushikb11]

@aniketmaurya Could you add a test as well for this edge case? It should be able to raise an Exception.

[aniketmaurya]

@aniketmaurya Could you add a test as well for this edge case? It should be able to raise an Exception.

Ok will do

[teddykoker]

Usually it's frowned upon to have empty lists/tuples as default arguments, see: https://nikos7am.com/posts/mutable-default-arguments/

I would make the default values None and pass an empty list if the value is None at runtime instead

[teddykoker]

Awesome thanks :)