I had already set up the database connection file, without success; the reason why it was empty now was that I removed all files and then downloaded them again from this website to make sure they were not messed up somehow, and this time I forgot to add the information to this file. Still, I thought I should be able to view at least part of the content of the files, even if I did mess up with the connection information?
Even so, I tried adding the connection details again, just as I did before, and this time it seems to be working... Strange, but I suppose one of the files must have been corrupted one way or another... Thanks anyway!
