Thank you for your reply.
I think the possibility to customize it by CSS would work. I could suppress all the data, that is not needed by hiding it. Not a nice solution, but it would work.
The needed download lists are as follows. So it's a little bit more than just hiding the title if it's empty:
1. A list of flyers with the following information:
- A preview picture
- A download link to a PDF file.
- A title
- A date for the event of the flyer.
2. A list of documents to download
- download link
- The last update date.
The best solution would be, if it would be possible to define a layout for a category. To overwrite the default layout. But as I understand, the concept works in a different way.