No attachment in ImageStudy

STU3 doesn't have content of images. Refer to DICOM

// Set `content` as Complex Obs
for (Attachment attachment : instance.getContent()) {
int conceptId = FHIRUtils.getImagingStudySeriesInstanceContentConcept().getConceptId();
if (attachment.getCreation() == null)

{ attachment.setCreation(new Date()); }

Obs complexObs = saveComplexData(conceptId, omrsPatient, attachment);
omrsInstance.addGroupMember(complexObs);
}
return omrsInstance;