Added checks to avoid crashes when trying to apply time curve to a point cache modifier that points to a non-existing cache.
Added checks to avoid crashes when trying to apply time curve to a point cache modifier that points to a non-existing cache.

git-svn-id: a3b746cc1383a42926249ed33eaccad697259b1b@19362 896c8824-d3f5-0310-9c61-ac502b9a79dc

blurstudio/cross3d