[Fixes #88171616] In drawData/animateSomePoints, detect that condition that paper is null and bail out because the user has closed the graph before the animation has finished.
[Fixes #88171616]
In drawData/animateSomePoints, detect that condition that paper is null and bail out because the user has closed the graph before the animation has finished.

concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap