Add null tests to avoid dereference errors encountered while debugging: - `_destroy()` can be called multiple times, so null-test `scrollAnimator` before destroying it - In `scrollToAlignWithRight()`, null-test `rightTable` before dereferencing it
Add null tests to avoid dereference errors encountered while debugging:
- `_destroy()` can be called multiple times, so null-test `scrollAnimator` before destroying it
- In `scrollToAlignWithRight()`, null-test `rightTable` before dereferencing it

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