Fix bug in NA calculation

[katy-sadowski]

See #651 - many users reporting an issue relating to calculation of NA status. Seems to result from cdmTable and measureValueCompleteness results being missing for CONDITION_OCCURRENCE.

I still don't know why so many people just started having this issue, but I think this fix should address the specific error. I'd still like to understand if there's a deeper issue that suddenly caused this state to appear for several users (myself included).

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.10%. Comparing base (5609499) to head (a016e0f).

Files with missing lines	Patch %	Lines
R/calculateNotApplicableStatus.R	85.71%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #654      +/-   ##
===========================================
- Coverage    87.14%   87.10%   -0.05%     
===========================================
  Files           17       17              
  Lines         1066     1078      +12     
===========================================
+ Hits           929      939      +10     
- Misses         137      139       +2     

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