Handle missing values in blocked MPI records

[bamader]

Description

This PR adds a filter function to the get_block_data function in the mpi_service. This filter function removes from consideration all candidates from the MPI who are part of a person cluster containing a patient who satisfied blocking criteria, but which themselves have present values (i.e. are not missing fields) that disagree with incoming blocking keys. This will make matching more precise and reinforce validity in the blocking step.

Related Issues

#231

Additional Notes

N/A

<--------------------- REMOVE THE LINES BELOW BEFORE MERGING --------------------->

Checklist

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• I have ensured that the pull request is of a manageable size, allowing it to be reviewed within a single session.
• I have reviewed my changes to ensure they are clear, concise, and well-documented.
• I have updated the documentation, if applicable.
• I have added or updated test cases to cover my changes, if applicable.
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Checklist for Reviewers

Please review and complete the following checklist during the review process:

• The code follows best practices and conventions.
• The changes implement the desired functionality or fix the reported issue.
• The tests cover the new changes and pass successfully.
• Any potential edge cases or error scenarios have been considered.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.80%. Comparing base (a2798c1) to head (3f7d80d).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #242      +/-   ##
==========================================
+ Coverage   97.72%   97.80%   +0.07%     
==========================================
  Files          32       33       +1     
  Lines        1674     1731      +57     
==========================================
+ Hits         1636     1693      +57     
  Misses         38       38              

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