CombinatorialDerivationConverter Issue

[metehanunal]

The converter throws an error with the file in the attachment.

java.lang.NullPointerException: Cannot invoke "org.sbolstandard.core2.ComponentDefinition.getComponents()" because the return value of "org.sbolstandard.core2.CombinatorialDerivation.getTemplate()" is null
	at org.sbolstandard.converter.sbol31_23.CombinatorialDerivationConverter.convertVariableFeature(CombinatorialDerivationConverter.java:44)
	at org.sbolstandard.converter.sbol31_23.CombinatorialDerivationConverter.convert(CombinatorialDerivationConverter.java:33)
	at org.sbolstandard.converter.sbol31_23.SBOLDocumentConverter.convert(SBOLDocumentConverter.java:151)
	

PoPSReceiverDetailed.ttl (changed to txt to upload)

PoPSReceiverDetailed.txt