FileSystem IO Ftp connection ls() method error for empty folders

[Nazar65]

Preconditions (*)

1. Magento 2.4-develop
2. Use the FTP connection by Magento\Framework\Filesystem\Io\Ftp

Regarding to the PHP documentation ftp_nlist() method can return as array and the false,
and in case of empty folder it returns false.

magento2/lib/internal/Magento/Framework/Filesystem/Io/Ftp.php

Line 316 in ad29452

$ls = @ftp_nlist($this->_conn, '.');

Need to add additional check for the (false) case ad not put result of ftp_nlist() directly to the foreach loop

Steps to reproduce (*)

1. Try to execute ls method of Magento\Framework\Filesystem\Io\Ftp::ls() on empty folder

Expected result (*)

1. [Screenshots, logs or description]
   2.. empty array returned

Actual result (*)

1. [Screenshots, logs or description]
2. Exception Returned
   Invalid argument supplied for foreach() in vendor/magento/framework/Filesystem/Io/Ftp.php on line 319

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• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
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• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @Nazar65. Thank you for your report.
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[Nazar65]

@magento I am working on this

[m2-assistant]

Hi @engcom-Alfa. Thank you for working on this issue.
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