[FIX] Mailer breaking if user doesn't have an email address (#14614)

app/mail-messages/server/functions/sendMail.js

@@ -42,8 +42,8 @@ export const sendMail = function(from, subject, body, dryrun, query) {
 			});
 		});
 	}
-
 	return Meteor.users.find(userQuery).forEach(function(user) {
+		if (user && user.emails && Array.isArray(user.emails) && user.emails.length) {
 			const email = `${ user.name } <${ user.emails[0].address }>`;
 
 			const html = placeholders.replace(body, {
@@ -61,5 +61,6 @@ export const sendMail = function(from, subject, body, dryrun, query) {
 				subject,
 				html,
 			});
+		}
 	});
 };