fix: handle empty array in maximumNonAdjacentSum

[shaked-shlomo]

Bug

Dynamic-Programming/MaxNonAdjacentSum.js guards the empty case with:

if (nums.length < 0) return 0

length is never negative, so this is dead code. For an empty array the function falls through, sets maxIncluding = nums[0] (undefined), skips the loop, and returns Math.max(0, undefined) → NaN instead of 0.

maximumNonAdjacentSum([]) // NaN  (should be 0)

Fix

Use nums.length === 0, matching the clearly-intended behavior. Added a test file (the module had none) covering the empty array, a single element, the documented examples, and an all-negative input.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.06%. Comparing base (5c39e87) to head (ad30e27).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1905      +/-   ##
==========================================
+ Coverage   85.91%   86.06%   +0.14%     
==========================================
  Files         379      379              
  Lines       19778    19778              
  Branches     3016     3020       +4     
==========================================
+ Hits        16993    17022      +29     
+ Misses       2785     2756      -29     

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