ceph: Add nil check for ceph version
ceph: Add nil check for ceph version

as CephVersion is pointer added a nil check
for CephVersion in status to avoid panic.

Signed-off-by: Madhu Rajanna <60fbf37a92c2a0908e31296d18dadbec5a4dae17@gmail.com>

rook/rook,rook/nfs,rook/nfs,rook/rook,rook/rook,rook/rook,rook/rook,rook/nfs