fix(bugs): enhancements and bugs in several areas (#4086)

extensions/dicom-microscopy/src/index.tsx

@@ -99,7 +99,9 @@ const extension: Types.Extensions.Extension = {
           const { microscopyService } = servicesManager.services;
 
           const activeInteractions = microscopyService.getActiveInteractions();
-
+          if (!activeInteractions) {
+            return false;
+          }
           const isPrimaryActive = activeInteractions.find(interactions => {
             const sameMouseButton = interactions[1].bindings.mouseButtons.includes('left');