Fixes for escapeJs method

Author: andrewbess

lib/internal/Magento/Framework/Escaper.php

@@ -303,11 +303,12 @@ public function encodeUrlParam($string)
      */
     public function escapeJs($string)
     {
-        if (!is_string($string) && !is_array($string)) {
+        if (!is_string($string)) {
             // In PHP > 8, preg_replace_callback throws an error if the 3rd param type is incorrect.
             // This check emulates an old behavior.
-            return $string;
+            $string = (string) $string;
         }
+
         if ($string === '' || ctype_digit($string)) {
             return $string;
         }

lib/internal/Magento/Framework/Test/Unit/EscaperTest.php

@@ -137,6 +137,8 @@ public function escapeJsDataProvider()
     {
         return [
             'zero length string' => ['', ''],
+            'null as string' => [null, ''],
+            'Magento\Framework\Phrase as string' => [__('test'), 'test'],
             'only digits' => ['123', '123'],
             '<' => ['<', '\u003C'],
             '>' => ['>', '\\u003E'],