ENGCOM-3483: fix php 7.2 error : Countable interface not implemented #19249

 - Merge Pull Request #19249 from adexos/magento2:2.3-develop
 - Merged commits:
   1. f1e7e3f
   2. a7b9122

Author: magento-engcom-team

lib/internal/Magento/Framework/File/Uploader.php

@@ -546,7 +546,7 @@ private function _setUploadFileId($fileId)
 
             preg_match("/^(.*?)\[(.*?)\]$/", $fileId, $file);
 
-            if (is_array($file) && count($file) > 0 && count($file[0]) > 0 && count($file[1]) > 0) {
+            if (is_array($file) && count($file) > 0 && !empty($file[0]) && !empty($file[1])) {
                 array_shift($file);
                 $this->_uploadType = self::MULTIPLE_STYLE;