You may want to make a post in the runtimes forum for the first question viewforum.php?f=7
(also explain what you mean, I don't understand)
As for the second question:
The runtimes dose little to none null checking, I imagine this is for performance, it should be done at your end.
you can see if an animation exists by nullchecking spSkeletonData_findAnimation(animState->data->skeletonData,animName)
