[MM-21934] don't do anything on cancel (#1168)

src/main.js

@@ -324,16 +324,16 @@ function handleSelectedCertificate(event, server, cert) {
     console.error(`there was no callback associated with: ${server}`);
     return;
   }
-  try {
   if (typeof cert === 'undefined') {
-      callback(); //user cancelled, so we use the callback without certificate.
+    console.log('user canceled certificate selection');
   } else {
+    try {
       callback(cert);
-    }
     } catch (e) {
       console.log(`There was a problem using the selected certificate: ${e}`);
     }
   }
+}
 
 function handleAppCertificateError(event, webContents, url, error, certificate, callback) {
   if (certificateStore.isTrusted(url, certificate)) {