feat(single_search.html): 搜索数据增加占位图

public/themes/website/1/en/demo/single_search.html

@@ -142,7 +142,10 @@
             }
           }
           $sr_cid = $vo['category_id'] ?? ($vo['category'][0]['id'] ?? 0);
-          $sr_thumb = is_array($vo['thumbnail'] ?? null) ? ($vo['thumbnail']['url'] ?? '') : '';
+          $sr_thumb = trim((string)(is_array($vo['thumbnail'] ?? null) ? ($vo['thumbnail']['url'] ?? '') : ''));
+          if ($sr_thumb === '') {
+            $sr_thumb = '/themes/dist_static/static/images/placeholder.png';
+          }
           $sr_url = hcUrl('detail/index', ['id' => $vo['id'], 'cid' => $sr_cid]);
           $sr_file = trim((string)($vo['url'] ?? ''));
           $has_sr_file = $sr_file !== '';

public/themes/website/1/zh/demo/single_search.html

@@ -142,7 +142,10 @@
             }
           }
           $sr_cid = $vo['category_id'] ?? ($vo['category'][0]['id'] ?? 0);
-          $sr_thumb = is_array($vo['thumbnail'] ?? null) ? ($vo['thumbnail']['url'] ?? '') : '';
+          $sr_thumb = trim((string)(is_array($vo['thumbnail'] ?? null) ? ($vo['thumbnail']['url'] ?? '') : ''));
+          if ($sr_thumb === '') {
+            $sr_thumb = '/themes/dist_static/static/images/placeholder.png';
+          }
           $sr_url = hcUrl('detail/index', ['id' => $vo['id'], 'cid' => $sr_cid]);
           $sr_file = trim((string)($vo['url'] ?? ''));
           $has_sr_file = $sr_file !== '';