[Qt5] QDir should provide an error code/string function for QDir::entryInfoList()

QDir::entryInfoList doc:

Returns an empty list if the directory is unreadable, does not exist, or if nothing matches the specification.

I need the error code/string (media failed, rights, FS corrupted, ...). The empty list doesn't explain the reason for failure.

Please, add way to know if all have work, AND error code and errorString(). Thanks.
It's very important in some case (right ok, but other error block the folder access).