fix: handle empty array in maximumNonAdjacentSum

[shaked-shlomo]

Bug

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

if(nums.length<0)return0

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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