@ohif/extension-cornerstone: Prevent errors when display set is empty object (0.0.40) (#637)

extensions/ohif-cornerstone-extension/src/OHIFCornerstoneViewport.js

@@ -202,6 +202,10 @@ class OHIFCornerstoneViewport extends Component {
       frameIndex,
     } = displaySet;
 
+    if (!studyInstanceUid || !displaySetInstanceUid) {
+      return;
+    }
+
     if (sopClassUids && sopClassUids.length > 1) {
       console.warn(
         'More than one SOPClassUid in the same series is not yet supported.'