FtpClient generates warning if ssl is to be used and server doesn't support it

[schultercrem]

I'm constructing FtpClient in this way:

$ftp = new FtpClient();
$ftp->connect('example.org', true, 21);
$ftp->login('foo', 'bar');

If server doesn't support SSL, FtpClient fails gracefully with exception:

Exception: Unable to list directory in FtpClient.php (line 225)

But it also generates a warning:

Warning: asort() expects parameter 1 to be array, boolean given in /.../src/Melihucar/FtpClient/FtpClient.php on line 222