Adding new scenario to refine_target_path

[galvana]

Closes #3905

Description Of Changes

Updating refine_target_path to return an empty path if the path is invalid, meaning the data doesn't exist at the level indicated.

Code Changes

• Added None value scenario to refine_target_path function

Steps to Confirm

• Added new test cases to test_refine_target_path.py

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Issue Requirements are Met
• Update CHANGELOG.md

[cypress]

Passing run #3511 ↗︎

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Details:

Merge c232ee7 into d97d2ad...
Project: fides	Commit: cb0f9cbbbb ℹ️
Status: Passed	Duration: 00:56 💡
Started: Aug 8, 2023 10:11 PM	Ended: Aug 8, 2023 10:12 PM

_{This comment has been generated by cypress-bot as a result of this project's GitHub integration settings.}

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (d97d2ad) 87.32% compared to head (c232ee7) 87.32%.

❗ Current head c232ee7 differs from pull request most recent head 4b92938. Consider uploading reports for the commit 4b92938 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3906   +/-   ##
=======================================
  Coverage   87.32%   87.32%           
=======================================
  Files         317      317           
  Lines       19397    19397           
  Branches     2494     2494           
=======================================
  Hits        16938    16938           
  Misses       2027     2027           
  Partials      432      432           

Files Changed	Coverage Δ
src/fides/api/task/refine_target_path.py	100.00% <100.00%> (ø)

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[pattisdr]

ah great improvement here - missed edge case, glad it's being addressed!