Fix templatig issue, when no values returned, closes #354

dist/datasource-zabbix/datasource.js

@@ -484,7 +484,7 @@ System.register(['lodash', 'app/core/utils/datemath', './utils', './migrations',
             }
 
             return result.then(function (metrics) {
-              return metrics.map(formatMetric);
+              return _.map(metrics, formatMetric);
             });
           }
         }, {

dist/datasource-zabbix/zabbix.js

@@ -194,14 +194,14 @@ System.register(['angular', 'lodash', './utils', './zabbixAPI.service.js', './za
    * Find group, host, app or item by given name.
    * @param  list list of groups, apps or other
    * @param  name visible name
-   * @return      array with finded element or undefined
+   * @return      array with finded element or empty array
    */
   function findByName(list, name) {
     var finded = _.find(list, { 'name': name });
     if (finded) {
       return [finded];
     } else {
-      return undefined;
+      return [];
     }
   }
 
@@ -211,14 +211,14 @@ System.register(['angular', 'lodash', './utils', './zabbixAPI.service.js', './za
    * which return only first finded.
    * @param  {[type]} list list of elements
    * @param  {[type]} name app name
-   * @return {[type]}      array with finded element or undefined
+   * @return {[type]}      array with finded element or empty array
    */
   function filterByName(list, name) {
     var finded = _.filter(list, { 'name': name });
     if (finded) {
       return finded;
     } else {
-      return undefined;
+      return [];
     }
   }