Avoid crash when registering resources
Avoid crash when registering resources

When a resource that has a support status different than SUPPORTED is
registered, the heat engine prints the message associated with its
SupportStatus object as a warning. This change avoids an engine crash
that occurs when a resource's SupportStatus does not define a message.

Change-Id: Id86bf93baade5b4fb0a71a80275b20d70710f2f4

maestro-hybrid-cloud/heat,cwolferh/heat-scratch,pratikmallya/heat,maestro-hybrid-cloud/heat,takeshineshiro/heat,srznew/heat,cwolferh/heat-scratch,takeshineshiro/heat,gonzolino/heat,rh-s/heat,rh-s/heat,gonzolino/heat,noironetworks/heat,jasondunsmore/heat,cryptickp/heat,steveb/heat,dragorosson/heat,srznew/heat,dims/heat,openstack/heat,noironetworks/heat,dims/heat,dragorosson/heat,openstack/heat,miguelgrinberg/heat,cryptickp/heat,miguelgrinberg/heat,steveb/heat,pratikmallya/heat,jasondunsmore/heat