Allow users to delete an adoptable

[tahbikat]

Alright so coming back to this. :P The code that ignores the error when an offspring doesn't exist is working great. Is there a way to have this also work if mothers and fathers were deleted as well? Whenever a mother or father is deleted, the babies get an error on their pages saying so. I tried to look in the code and figure it out myself but not getting anywhere. ><