修复各频道首页底部banner的banner报错的bug

@@ -142,10 +142,10 @@ class HomeModel
 
         // 调用接口获取数据
         $banner = IndexData::getBannerStart($resource);
-        if (isset($banner['code']) && $banner['code'] == 200) {
+        if (isset($banner['code']) && $banner['code'] == 200 && $banner['data']['total'] > 0) {
             $result = array();
             // 处理数据
-            foreach ($banner['data'] as $val) {
+            foreach ($banner['data']['list'] as $val) {
                 foreach ($val['data'] as $single) {
                     $result['url'] = ($channel === 2) ? Helpers::url('/boys') : Helpers::url('/girls');
                     $result['img'] = Helpers::getImageUrl($single['src'], 640, 200);