Bug 11633 : Block Issue if fines require staff override
If a patrons fines exceed noissuescharge and we allow
staff to allow issue at their discretion via an override
the SIP process allowed charges to go ahead.
This patch closes the loophole which allowed self issue
to subvert the usual library loan policy
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz> Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com> Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>