US Core 3.1

[garyisaac]

What happened?

Synthea throws an error when configuring a properties file to use US Core 3.1. US Core 4 and 5 work. Please let me know if Synthea still supports US Core 3.

exporter.fhir.us_core_version = 3.1

Environment

- OS: Windows 10
- Java:

Relevant log output

49 -- Elenora790 Legros616 (70 y/o F) Boston, Massachusetts  (147111)
java.lang.NullPointerException
        at org.mitre.synthea.export.FhirR4.observation(FhirR4.java:1873)
        at org.mitre.synthea.export.FhirR4.convertToFHIR(FhirR4.java:432)
        at org.mitre.synthea.export.FhirR4.convertToFHIRJson(FhirR4.java:527)
        at org.mitre.synthea.export.Exporter.exportRecord(Exporter.java:269)
        at org.mitre.synthea.export.Exporter.export(Exporter.java:188)
        at org.mitre.synthea.engine.Generator.generatePerson(Generator.java:541)
        at org.mitre.synthea.engine.Generator.lambda$run$3(Generator.java:383)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
        at java.base/java.lang.Thread.run(Thread.java:834)