2.0/Fix integration test - null is returned instead of true/false

[cheng13231]

Describe the bug

In a CQL, we have following define, a Boolean result (true/false) is expected not null

define "Numerator":
  "Most Recent Viral Load Test During Measurement Period".value < 200 '{copies}/mL'
    or "Most Recent Viral Load Test During Measurement Period".value ~ "Below threshold level (qualifier value)"
    or "Most Recent Viral Load Test During Measurement Period".value ~ "Not detected (qualifier value)"

To Reproduce Steps to reproduce the behavior:

1. Run following integration test HIVViralSuppressionFHIR -> test case 061ab97e-4e5d-4c1d-91dc-21e34b415b5b
2. See error

Version used:

• Version: develop-2.0 (commit https://github.com/FirelyTeam/firely-cql-sdk/commit/25584e496722c12894d706b6757fd4cd0f52c074)