fix: use SeriesMetadata method instead of property in findMostRecentStructuredReport (#2038)

fixes #1714

Call getInstanceCount() instead of manually checking length (which does not work)

Co-authored-by: Stefan Silviu <silviu.stefan@ab4.systems>

platform/core/src/DICOMSR/utils/findMostRecentStructuredReport.js

@@ -13,7 +13,7 @@ const findMostRecentStructuredReport = studies => {
       // Skip series that may not have instances yet
       // This can happen if we have retrieved just the initial
       // details about the series via QIDO-RS, but not the full metadata
-      if (!series.instances || !series.instances.length) {
+      if (!series || series.getInstanceCount() === 0) {
         return;
       }