框架升级及修复升级后的bug

backend/application/admin/command/Crud/stubs/mixins/checkbox.stub

@@ -1,7 +1,7 @@
 
     public function {%methodName%}($value, $data)
     {
-        $value = $value ? $value : (isset($data['{%field%}']) ? $data['{%field%}'] : '');
+        $value = $value ?: ($data['{%field%}'] ?? '');
         $valueArr = explode(',', $value);
         $list = $this->{%listMethodName%}();
         return implode(',', array_intersect_key($list, array_flip($valueArr)));

backend/application/admin/command/Crud/stubs/mixins/datetime.stub

@@ -1,6 +1,6 @@
 
     public function {%methodName%}($value, $data)
     {
-        $value = $value ? $value : (isset($data['{%field%}']) ? $data['{%field%}'] : '');
+        $value = $value ?: ($data['{%field%}'] ?? '');
         return is_numeric($value) ? date("Y-m-d H:i:s", $value) : $value;
     }

backend/application/admin/command/Crud/stubs/mixins/radio.stub

@@ -1,7 +1,7 @@
 
     public function {%methodName%}($value, $data)
     {
-        $value = $value ? $value : (isset($data['{%field%}']) ? $data['{%field%}'] : '');
+        $value = $value ?: ($data['{%field%}'] ?? '');
         $list = $this->{%listMethodName%}();
-        return isset($list[$value]) ? $list[$value] : '';
+        return $list[$value] ?? '';
     }

backend/application/admin/command/Crud/stubs/mixins/select.stub

@@ -1,7 +1,7 @@
 
     public function {%methodName%}($value, $data)
     {
-        $value = $value ? $value : (isset($data['{%field%}']) ? $data['{%field%}'] : '');
+        $value = $value ?: ($data['{%field%}'] ?? '');
         $list = $this->{%listMethodName%}();
-        return isset($list[$value]) ? $list[$value] : '';
+        return $list[$value] ?? '';
     }