Check for class (sugarlabs#4716)

* fix regression with new save file type

* simplify logic for distiguishing between saved data types

---------

Co-authored-by: Walter Bender <[email protected]>

Author: walterbender

js/activity.js

@@ -6479,15 +6479,15 @@ class Activity {
                                 let obj;
                                 try {
                                     if (cleanData.includes("html")) {
-					try {
-					    obj = JSON.parse(
-						cleanData.match('<div class="code" id="codeBlock">(.+?)</div>')[1]
+                                        if (cleanData.includes("id=\"codeBlock\"")) {
+                                            obj = JSON.parse(
+                                                cleanData.match('<div class="code" id="codeBlock">(.+?)</div>')[1]
                                             );
-					} catch (e) {
-					    obj = JSON.parse(
-						cleanData.match('<div class="code">(.+?)</div>')[1]
+                                        } else {
+                                            obj = JSON.parse(
+                                                cleanData.match('<div class="code">(.+?)</div>')[1]
                                             );
-					}
+                                        }
                                     } else {
                                         obj = JSON.parse(cleanData);
                                     }