fixed json serializer of dv_identifier

gradle.properties

@@ -1,2 +1,2 @@
-version = 1.9.5
+version = 1.9.6
 group = com.cabolabs

src/main/groovy/com/cabolabs/openehr/formats/OpenEhrJsonParserQuick.groovy

@@ -722,8 +722,6 @@ class OpenEhrJsonParserQuick {
       def slurper = new JsonSlurper()
       def map = slurper.parseText(json)
 
-      // FIXME: EHR is not LOCATABLE and doesn't have info about the rm_version!
-      // For the API EHR we could access the EHR_STATUS.archetype_details.rm_version, but for RM EHRs, ehr_status is an OBJECT_REF that should be resolved.
       if (this.schemaValidate)
       {
          // independently from schemaFlavor, this will always be "api" since it is asking to parse an API EhrDto

src/main/groovy/com/cabolabs/openehr/formats/OpenEhrJsonSerializer.groovy

@@ -1392,10 +1392,10 @@ class OpenEhrJsonSerializer {
    {
       def out = [:]
 
-      out.issuer = o.issuer
-      out.assigner = o.assigner
       out.id = o.id
-      out.type = o.type
+      if (o.issuer) out.issuer = o.issuer
+      if (o.assigner) out.assigner = o.assigner
+      if (o.type) out.type = o.type
 
       return out
    }

src/test/groovy/com/cabolabs/openehr/opt/ValidationFlowTest.groovy

@@ -1072,6 +1072,7 @@ class ValidationFlowTest extends GroovyTestCase {
       def parser = new OpenEhrJsonParserQuick(true)
       parser.setSchemaFlavorAPI()
       PersonDto person = parser.parsePersonDto(json_person)
+      //PersonDto person = parser.parseActorDto(json_person) // This also works
 
       println parser.getJsonValidationErrors()