fix can not remove all tags

include/functions.php

@@ -5311,6 +5311,9 @@ function insert_torrent_tags($torrentId, $tagIdArr, $sync = false)
     if ($sync) {
         sql_query("delete from torrent_tags where torrent_id = $torrentId");
     }
+    if (empty($tagIdArr)) {
+        return;
+    }
     $insertTagsSql = 'insert into torrent_tags (`torrent_id`, `tag_id`, `created_at`, `updated_at`) values ';
     $values = [];
     foreach ($tagIdArr as $tagId) {

public/takeedit.php

@@ -224,9 +224,7 @@ if (!empty($_POST['custom_fields'])) {
  * @since v1.6
  */
 $tagIdArr = array_filter($_POST['tags'] ?? []);
-if (!empty($tagIdArr)) {
-    insert_torrent_tags($id, $tagIdArr, true);
-}
+insert_torrent_tags($id, $tagIdArr, true);
 
 if($CURUSER["id"] == $row["owner"])
 {