Merge pull request #6 from 15web/fix-parent-depth

Fix depth condition

Author: pchelk1n

src/Components/Form/ParentSelect.php

@@ -24,7 +24,7 @@ public static function make(QueryBuilder $query): Select
             );
 
             $depth = $item->getAttribute('depth');
-            if ($depth < 1) {
+            if ($depth < 0) {
                 throw new RuntimeException('The tree is corrupted, please Fix tree');
             }