The patron hold history page shows "No title" for old holds on records that have since been deleted. We should get the title from deletedbibios if possible.
Impossible, we lost the link. We need bug 25260.
I have confirmed it. In old_reserves the biblionumber is set to NULL when the bibliographic record is deleted. I know that merging the tables is the ultimate solution, but is there another solution we could think of? Maybe we could not cascade on delete?
In the meantime I think we need an update to the holds history page in the OPAC to exclude deleted titles.