Bug 14968 - found shouldn't be set to null when cancelling holds

Bug 14968 - found shouldn't be set to null when cancelling holds

Signed-off-by: JM Broust <jean-manuel.broust@univ-lyon2.fr>
Signed-off-by: Broust <jean-manuel.broust@univ-lyon2.fr>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit 83328c1061af0ae82d8a2086e298375875e2dfa9)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>
(cherry picked from commit 3bed66a3e2a9d9eafe69a19442e34413b4e9a399)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>