Include missed throw error.

packages/email/email.js

@@ -293,7 +293,7 @@ Email.sendAsync = async function (options) {
   if (Meteor.isProduction && !mailUrlEnv && !mailUrlSettings) {
     // This check is mostly necessary when using the flag --production when running locally.
     // And it works as a reminder to properly set the mail URL when running locally.
-    new Error(
+    throw new Error(
       'You have not provided a mail URL. You can provide it by using the environment variable MAIL_URL or your settings. You can read more about it here: https://docs.meteor.com/api/email.html.'
     );
   }