1435 | handle DoB or age missing

[maimoonak]

Fixes #1435

Checklist

• I have written Unit tests for any new feature(s) and edge cases for bug fixes
• I have added any strings visible on UI components to the strings.xml file
• I have updated the CHANGELOG.md file for any notable changes to the codebase
• I have run ./gradlew spotlessApply and ./gradlew spotlessCheck to check my code follows the project's style guide
• I have built and run the fhircore app to verify my change fixes the issue and/or does not break the app

[codecov]

Codecov Report

Merging #1441 (5cf5f66) into main (ea568be) will increase coverage by 0.51%.
The diff coverage is 16.66%.

@@             Coverage Diff              @@
##               main    #1441      +/-   ##
============================================
+ Coverage     38.88%   39.39%   +0.51%     
- Complexity      827      837      +10     
============================================
  Files           234      234              
  Lines          9091     9090       -1     
  Branches       1492     1496       +4     
============================================
+ Hits           3535     3581      +46     
+ Misses         5064     4999      -65     
- Partials        492      510      +18     

Flag	Coverage Δ
engine	62.86% <20.00%> (+0.95%)	⬆️
quest	12.39% <0.00%> (ø)

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Impacted Files	Coverage Δ
...e/data/local/register/dao/AncPatientRegisterDao.kt	0.00% <0.00%> (ø)
.../data/local/register/dao/AppointmentRegisterDao.kt	17.64% <0.00%> (ø)
...e/engine/data/local/register/dao/HivRegisterDao.kt	69.23% <0.00%> (ø)
...rcore/quest/util/mappers/RegisterViewDataMapper.kt	1.85% <0.00%> (ø)
...ngine/data/local/register/dao/FamilyRegisterDao.kt	17.39% <50.00%> (+17.39%)	⬆️
...fhircore/engine/util/extension/PatientExtension.kt	72.81% <0.00%> (+0.97%)	⬆️
...ister/fhircore/engine/domain/model/RegisterData.kt	90.76% <0.00%> (+20.00%)	⬆️

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