ZIP files without an explicit entry for top level directory are not recognized

[MJochim]

As per the standard, ZIP files do not need to contain explicit entries for directories (and technically, cannot – but all vendors seem to agree to include them anyway). Windows 10, for example, does include entries for sub-directories (e.g. the session directories), but not for the top-level directory. A Win10 zip file might look like this:

myDatabase_emuDB/myDatabase_DBconfig.json
myDatabase_emuDB/spkA_ses/
myDatabase_emuDB/spkA_ses/something.txt

Zip files I have seen from MacOS, GNU zip, 7z and some others would rather look like this:

myDatabase_emuDB/
myDatabase_emuDB/myDatabase_DBconfig.json
myDatabase_emuDB/spkA_ses/
myDatabase_emuDB/spkA_ses/something.txt

The former are currently not recognized by emuDB manager's backend, because it explicitly looks for the top level directory entry. As a consequence, the users are told that such ZIP files do not contain an emu speech database, which is not true.