The OpenOffice writer crashed when I use the point "Extras ->
Literaturdatenbank". BUT only if "base" isn´t installed.

Steps to reproduce:

1.) create a new open office document
2.) create and add a new base libary for the books.
3.) add a book to the libary and add it to the document
4.) save the document and close open office
5.) remove base
6.) open writer and open the open office document
7.) click on "Extras -> Literaturdatenbank"
8.) Open Office will crash

I think the best way would be to show a warning that the base product couldn´t
be found. For me as an advanced user this was easy to find. But for a normal
user who has no experience with PCs he might be lost...