Bug 23321: (follow-up) Require cash registers for payments

Bug 23321: (follow-up) Require cash registers for payments

This follow-up catches the case where no cash registers have been
defined for the current branch and as such payments cannot be processed.

Test plan:
1) Ensure you have 'UseCashRegisters' set to 'Do'
2) Attempt to make a payment for a fee whilst logged into a branch that
   has not yet had cash registers configured.
3) Note that you are shown a warning and cannot proceed.
4) Signoff

Sponsored-by: PTFS Europe
Sponsored-by: Cheshire Libraries Shared Services

Signed-off-by: Maryse Simard <maryse.simard@inlibro.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>