Fix: Detect cases where null is referenced with incorrect case or relative to the root namespace

[localheinz]

This pull request

• adjusts the Analyzer to detect cases where null is referenced with incorrect case or relative to the root namespace

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.46%. Comparing base (b8992e4) to head (62ce4bb).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #897   +/-   ##
=========================================
  Coverage     98.46%   98.46%           
- Complexity      198      200    +2     
=========================================
  Files            24       24           
  Lines           715      717    +2     
=========================================
+ Hits            704      706    +2     
  Misses           11       11           

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