fix studyDate sort and display

extensions/default/src/DicomWebDataSource/qido.js

@@ -46,16 +46,17 @@ function processResults(qidoStudies) {
   qidoStudies.forEach(qidoStudy =>
     studies.push({
       studyInstanceUid: getString(qidoStudy['0020000D']),
-      date: getString(qidoStudy['00080020']),
+      date: getString(qidoStudy['00080020']), // YYYYMMDD
       time: getString(qidoStudy['00080030']), // HHmmss.SSS (24-hour, minutes, seconds, fractional seconds)
-      accession: getString(qidoStudy['00080050']), // short string, probably a number?
-      mrn: getString(qidoStudy['00100020']), // medicalRecordNumber
-      patientName: getName(qidoStudy['00100010']),
-      instances: Number(getString(qidoStudy['00201208'])), // number
-      description: getString(qidoStudy['00081030']),
-      modalities: getString(
-        getModalities(qidoStudy['00080060'], qidoStudy['00080061'])
-      ),
+      accession: getString(qidoStudy['00080050']) || '', // short string, probably a number?
+      mrn: getString(qidoStudy['00100020']) || '', // medicalRecordNumber
+      patientName: getName(qidoStudy['00100010']) || '',
+      instances: Number(getString(qidoStudy['00201208'])) || 0, // number
+      description: getString(qidoStudy['00081030']) || '',
+      modalities:
+        getString(
+          getModalities(qidoStudy['00080060'], qidoStudy['00080061'])
+        ) || '',
     })
   );