dirDetails throws FTPException when a file does not exist

Using the dirDetails command with a fileName as argument, throws an exception when the file doesn't exist (replyCode 450 (proFTPD) and wu-FTP (550)).
Looking at the source code, I was wondering, wether the aim of the developpers was, NOT to throw an exception and just return an empty file list ?
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[support2]

The aim is to throw an exception if it doesn't exist.