Bug 7791: (follow-up) tidy up some cruft in the main patch

Bug 7791: (follow-up) tidy up some cruft in the main patch

This patch
- delete warns
- add a missing }
- add a condition in template of avoiding asking to delete orders or
  records if the basket is empty

To test :
1. Make the same tests as defined in test plan of main patch. It should
   behave the same way
2. Try to delete a basket with no records inside. You will only have a
   "Delete basket" button, with fewer warnings

Signed-off-by: Cedric Vita <cedric.vita@dracenie.com>
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit 2c307f3e92d6e4051a37f19bb17f60f45fded9d9)
Signed-off-by: Fridolin SOMERS <fridolin.somers@biblibre.com>