Make sure the resource exists before trying to update it.
Make sure the resource exists before trying to update it.

Change-Id: I5d8bdc0f4ceff61cab0b909dcaaf8ab5952ba4af
Signed-off-by: Angus Salkeld <86b65304d27d8de73dd7d624c33df7e088f8d94b@redhat.com>

citrix-openstack-build/heat,jasondunsmore/heat,JioCloud/heat,redhat-openstack/heat,pratikmallya/heat,cryptickp/heat,miguelgrinberg/heat,rdo-management/heat,dragorosson/heat,redhat-openstack/heat,ntt-sic/heat,Triv90/Heat,ntt-sic/heat,steveb/heat,rh-s/heat,srznew/heat,miguelgrinberg/heat,takeshineshiro/heat,JioCloud/heat,gonzolino/heat,pratikmallya/heat,citrix-openstack-build/heat,varunarya10/heat,jasondunsmore/heat,Triv90/Heat,NeCTAR-RC/heat,maestro-hybrid-cloud/heat,gonzolino/heat,cwolferh/heat-scratch,rh-s/heat,openstack/heat,cwolferh/heat-scratch,noironetworks/heat,pshchelo/heat,rdo-management/heat,rickerc/heat_audit,rickerc/heat_audit,srznew/heat,dims/heat,dims/heat,pshchelo/heat,steveb/heat,takeshineshiro/heat,noironetworks/heat,NeCTAR-RC/heat,Triv90/Heat,maestro-hybrid-cloud/heat,openstack/heat,cryptickp/heat,varunarya10/heat,dragorosson/heat