Prevent error when PHP extension iconv() not enabled.

Author: sangnguyenplus

src/QueryDataTable.php

@@ -863,7 +863,7 @@ protected function showDebugger(array $output): array
     {
         $query_log = $this->getConnection()->getQueryLog();
         array_walk_recursive($query_log, function (&$item) {
-            if (is_string($item)) {
+            if (is_string($item) && extension_loaded('iconv')) {
                 $item = iconv('iso-8859-1', 'utf-8', $item);
             }
         });
@@ -943,7 +943,6 @@ public function ordering(): void
      * @param  string  $model
      * @param  int  $max_hits
      * @return $this
-     *
      * @throws \Exception
      */
     public function enableScoutSearch(string $model, int $max_hits = 1000): static
@@ -1084,7 +1083,6 @@ protected function applyFixedOrderingToQuery(string $keyName, array $orderedKeys
      * @param  string  $searchKeyword
      * @param  mixed  $searchFilters
      * @return array
-     *
      * @throws \Exception
      */
     protected function performScoutSearch(string $searchKeyword, mixed $searchFilters = []): array