Handle empty array input in selection sort

[MayankSharma-2812]

Adds an early return to handle empty array inputs gracefully without affecting existing selection sort logic.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 85.36585% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.89%. Comparing base (08d8c6b) to head (b135a51).

Files with missing lines	Patch %	Lines
Search/BinarySearch.js	66.66%	4 Missing ⚠️
Sorts/SelectionSort.js	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1875      +/-   ##
==========================================
- Coverage   85.91%   85.89%   -0.03%     
==========================================
  Files         379      379              
  Lines       19778    19783       +5     
  Branches     3015     3022       +7     
==========================================
- Hits        16993    16992       -1     
- Misses       2785     2791       +6     

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