Exclude messages that don't have text property

Author: nodaguti

lib/formatter.js

@@ -10,7 +10,9 @@ module.exports = function(opts) {
   var positionless = options.positionless || 'first';
 
   return function(input) {
-    var messages = input.messages;
+    var messages = input.messages.filter(function(message) {
+      return typeof message.text === 'string';
+    });
     var source = input.source;
 
     if (!messages.length) return '';