#334 7zip 4.15beta can't create archive on directory with >1 file

[Anonymous]

If there is more than 1 file or directory in the 7-Zip
File Manager or Explorer window, creating archive via
'Add to Archive' dialogue causes 7-Zip to return with
'unknown error' message, and no archive is created. It
doesn't matter what format of the archive is or
compression setting being used. This did not happen on
7-Zip 3.13. This is a correction to bug 1047310.