修复非数据库字段乱入问题

src/Model/Meta.php

@@ -166,7 +166,7 @@ class Meta
         {
             /** @var Column $column */
             $column = $columns[0];
-            if (isset($column->name))
+            if (null !== $column->name)
             {
                 $dbFields[$column->name] = [
                     'propertyName' => $name,