NumberUtils check if Number is null or zero

[AndyPilz]

Added new methods in NumberUtils to check whether an number is null or zero

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.04%. Comparing base (770e72d) to head (6baea48).
⚠️ Report is 2254 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #993   +/-   ##
=========================================
  Coverage     92.04%   92.04%           
- Complexity     7430     7435    +5     
=========================================
  Files           193      193           
  Lines         15674    15674           
  Branches       2898     2899    +1     
=========================================
  Hits          14427    14427           
  Misses          674      674           
  Partials        573      573           

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