Repository: jqhph/dcat-admin (language: php)

Issue:
v2.2.1-beta 版本数值为0时 列表不显示
- Laravel Version: 9.1
- PHP Version: 8.0
- Dcat Admin Version:v2.2.1-beta

### Description:
![image](https://user-images.githubusercontent.com/28970916/175849744-3c7954c3-89e7-4d89-a57e-812c94624dc6.png)

v2.2.0-beta 版本是可以的
### Steps To Reproduce:



Discussion / hints:
请贴下grid表格的完整代码

Fix patch:
diff --git a/src/Support/Helper.php b/src/Support/Helper.php
index b6b4104ec..d62873ecc 100755
--- a/src/Support/Helper.php
+++ b/src/Support/Helper.php
@@ -836,10 +836,10 @@ public static function htmlEntityEncode($item)
         }
         if (is_array($item)) {
             array_walk_recursive($item, function (&$value) {
-                $value = htmlentities($value);
+                $value = htmlentities($value ?? '');
             });
         } else {
-            $item = $item ? htmlentities($item) : null;
+            $item = htmlentities($item ?? '');
         }
 
         return $item;


Test patch: