Template with master BUT without "real" slide

Hello!
I use different template files (POT), created with PPT 2003.
These files have ONLY master slides, BUT NO "real" slide.
If I open a template with Aspose it works, BUT inserting a Slide throws an exception saying that there is no slide in this presentation.

Is this a BUG or a FEATURE?

PPT can work with such files.

Peter

Sorry, presentations without slides are not supported.