Bug 16582 t/Price.t test should pass if Test::DBIx::Class is not available

Bug 16582 t/Price.t test should pass if Test::DBIx::Class is not available

TEST PLAN
---------
1) prove t/Prices.t
   -- failure
2) apply patch
3) prove t/Prices.t
   -- nicely skipped when Test::DBIx::Class is not available.

Signed-off-by: Srdjan <srdjan@catalyst.net.nz>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>
(cherry picked from commit 5ba5f9e0c5958b518bd648f08146329e355f3a7e)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>