Improved handling of manager messages to select the first object in the manager if the current one gets destroyed, NULL if empty.
Improved handling of manager messages to select the first object in
the manager if the current one gets destroyed, NULL if empty.


git-svn-id: 4705079bc6b8aadf675e3696f5c015a6aa4916e3@1079 3c1deb5b-d424-0410-962d-aba41a686d42

hsorby/zinc,OpenCMISS/zinc,hsorby/zinc,hsorby/zinc,hsorby/zinc,OpenCMISS/zinc,OpenCMISS/zinc,OpenCMISS/zinc