Try...catch on testworker.js

www/common/cryptpad-common.js

@@ -1158,6 +1158,7 @@ define([
             Nthen(function (waitFor2) {
                 if (Worker) {
                     var w = waitFor2();
+                    try {
                         worker = new Worker('/common/outer/testworker.js?' + urlArgs);
                         worker.onerror = function (errEv) {
                             errEv.preventDefault();
@@ -1170,6 +1171,10 @@ define([
                                 w();
                             }
                         };
+                    } catch (e) {
+                        noWorker = true;
+                        w();
+                    }
                 }
                 if (typeof(SharedWorker) !== "undefined") {
                     try {