Handle null/undefined options for isInt and isFloat

[omalk98]

What has been modified

Bug(isInt): Returns true in case an option was passed as null/undefined for that specific condition
Bug(isFloat): Returns true in case an option was passed as null/undefined for that specific condition

What has been done

Added checks for null and undefined in both functions isInt and isFloat to be able to handle cases of null/undefined

Old code example:

isInt("5", {min: undefined, max: null}) // => false
isInt("5", {gt: null, lt: undefined}) // => false

isFloat("5.5", {min: null, max: undefined}) // => false
isFloat("5.5", {gt: undefined, lt: null}) // => false

Updated (New) code example:

isInt("5", {min: undefined, max: null}) // => true
isInt("5", {gt: null, lt: undefined}) // => true

isFloat("5.5", {min: null, max: undefined}) // => true
isFloat("5.5", {gt: undefined, lt: null}) // => true

Issue Referenced

#2328

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)
• References provided in PR (where applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b958bd7) 99.95% compared to head (c450fe6) 99.95%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2330      +/-   ##
==========================================
- Coverage   99.95%   99.95%   -0.01%     
==========================================
  Files         107      107              
  Lines        2454     2449       -5     
  Branches      619      619              
==========================================
- Hits         2453     2448       -5     
  Partials        1        1              

Files	Coverage Δ
src/lib/isFloat.js	100.00% <ø> (ø)
src/lib/isInt.js	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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