SDK getResource failOnNoData flag

[AndrewTwydell]

What It Does
Adds a failOnNodata flag, defaulting to true (which is the current behaviour), to dictate if CMCI sending a NODATA response should throw an error or not.

• PR relies on Using real data for unit test mocking #204

Review Checklist
I certify that I have:

• tested my changes
• added/updated automated tests
• updated the changelog
• followed the contribution guidelines

Additional Comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.42%. Comparing base (63501a8) to head (ec5b1e2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #205      +/-   ##
==========================================
+ Coverage   28.37%   28.42%   +0.05%     
==========================================
  Files         148      148              
  Lines        5082     5083       +1     
  Branches      892      892              
==========================================
+ Hits         1442     1445       +3     
+ Misses       3640     3638       -2     

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