Check HttpHost instance for null prior to dereferencing it

[jtduffy]

Resolves #1717

Retrieve the URI instance from the HttpPost instance unless it's null, then pull the required info from the HttpRequest instance.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fb80af4) 70.73% compared to head (e5f0945) 70.76%.
Report is 7 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1722      +/-   ##
============================================
+ Coverage     70.73%   70.76%   +0.02%     
- Complexity     9926     9931       +5     
============================================
  Files           828      828              
  Lines         39855    39855              
  Branches       6033     6033              
============================================
+ Hits          28193    28203      +10     
+ Misses         8931     8927       -4     
+ Partials       2731     2725       -6     

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