IDC2361: fix seg combobox filling

extensions/dicom-segmentation/src/utils/setActiveLabelMap.js

@@ -47,16 +47,11 @@ export default async function setActiveLabelmap(
     return labelmapIndex;
   }
 
-  if (displaySet.isLoading) {
-    return activeLabelmapIndex;
-  }
-
   if (!displaySet.isLoaded) {
     try {
       await displaySet.load(referencedDisplaySet, studies);
     } catch (error) {
       displaySet.isLoaded = false;
-      displaySet.isLoading = false;
       displaySet.loadError = true;
       onDisplaySetLoadFailure(error);
 
@@ -74,8 +69,11 @@ export default async function setActiveLabelmap(
 
   // This might have just been created, so need to use the non-cached value.
   state = cornerstoneTools.getModule('segmentation').state;
+
   brushStackState = state.series[firstImageId];
-  brushStackState.activeLabelmapIndex = labelmapIndex;
+  if (brushStackState) {
+    brushStackState.activeLabelmapIndex = labelmapIndex;
+  }
 
   refreshViewports();
   callback();