Fix unhandled callback errors

public/src/admin/settings/email.js

@@ -79,6 +79,10 @@ define('admin/settings/email', ['admin/settings'], function(settings) {
 		}
 
 		socket.emit('meta.getServerTime', {}, function(err, now) {
+			if (err) {
+				return app.alertError(err.message);
+			}
+
 			now = new Date(now);
 
 			$('#serverTime').text(now.toString());

src/controllers/authentication.js

@@ -381,7 +381,9 @@ authenticationController.localLogin = function(req, username, password, next) {
 			if (result.banned) {
 				// Retrieve ban reason and show error
 				return user.getLatestBanInfo(uid, function(err, banInfo) {
-					if (banInfo.reason) {
+					if (err) {
+						next(err);
+					} else if (banInfo.reason) {
 						next(new Error('[[error:user-banned-reason, ' + banInfo.reason + ']]'));
 					} else {
 						next(new Error('[[error:user-banned]]'));