Bug 8820 - Don't show orders table if there are no orders

Bug 8820 - Don't show orders table if there are no orders

This page removes the "basket empty" message in favor of
hiding the orders table altogether when a basket has no
orders. This patch also moves the "Show all details"
checkbox under the "Orders" heading to associate it more
closely with the area it affects.

Other textual changes:

- Correcting capitalization according to coding guidelines
- Correcting terminology (basket group instead of basketgroup)
- Replacing the "Order Details" heading with the more
  succinct "Orders"

Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>