MC-3496: Static block widget is broken in inline mode

Wrap in try/catch

Author: danmooney2

lib/web/mage/adminhtml/wysiwyg/widget.js

@@ -275,7 +275,11 @@ define([
             }
 
             if (e != undefined && e.id) { //eslint-disable-line eqeqeq
-                widgetCode = Base64.idDecode(e.id);
+                try {
+                    widgetCode = Base64.idDecode(e.id);
+                } catch (ex) {
+                    return false;
+                }
 
                 if (widgetCode.indexOf('{{widget') !== -1) {
                     this.optionValues = new Hash({});