improve error check

lib/emailservice.js

@@ -140,14 +140,16 @@ EmailService.prototype._loadTemplate = function(emailType, recipient, extension,
 };
 
 EmailService.prototype._applyTemplate = function(template, data, cb) {
+  var error;
   var result = _.mapValues(template, function(t) {
     try {
       return Mustache.render(t, data);
     } catch (e) {
       log.error('Could not apply data to template', e);
-      return cb(e);
+      error = e;
     }
   });
+  if (error) return cb(error);
   return cb(null, result);
 };