Fixed javascript error caused by CKEDITOR

This was not really a problem, just annoying. But now it is fixed.
Fixes issue #457

assets/controllers/elements/ckeditor_controller.js

@@ -70,7 +70,9 @@ export default class extends Controller {
                         editor_div.classList.add(...new_classes.split(","));
                     }
 
-                    console.log(editor);
+                    //This return is important! Otherwise we get mysterious errors in the console
+                    //See: https://github.com/ckeditor/ckeditor5/issues/5897#issuecomment-628471302
+                    return editor;
                 })
                 .catch(error => {
                     console.error(error);