code review by fei.hong: do feature 3.2.5

@@ -38,11 +38,11 @@ class SideModel
 
         // 调用接口获取后台配置的侧边栏数据
         $side = SideData::leftNav();
-        if (!empty($side['data'])) {
+        if (!empty($side['data']) && is_array($side['data'])) {
             $group = array();
             $num = 0;
             $groupKey = 0;
-            $count = count(($side['data']));
+            $count = count($side['data']);
             foreach ($side['data'] as $key => $value) {
                 if ($value['separative_sign'] === 'Y') {
                     $result[$num] = $group;