Bug 20840: (bug 2696 follow-up) Fix biblio info fetch

Bug 20840: (bug 2696 follow-up) Fix biblio info fetch

There is no accountlines.biblionumber field, if the account line is
linked to an item, accountline-details.pl will explode with:
Template process failed: undef error - The method biblionumber is not
covered by tests!

Test plan:
Create a fine for a given item
Pay the fine
View the detail of the account line

=> Without this patch you get a software error
=> With this patch applied you will see the biblio's title

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>