Fix error 'window is undefined' that may appear

- Avoid possible errors, because of 'window' is only defined on browser side but not in NodeJS on client side. Check for 'typeof window' is neccessary, because if it's not defined at all you can't check for 'window !== undefined' without the same error 'window is undefined'.

webapp/components/utils/InternalPages.js

@@ -34,7 +34,7 @@ class PageParams {
   redirectToPage(thisComponent) {
     if (this.isInternalPage) {
       thisComponent.$router.push(this.internalPage.pageRoute)
-    } else {
+    } else if (typeof window !== 'undefined') {
       window.location.href = this.externalLink
     }
   }