Allow empty animation queues.
Allow empty animation queues.

* Use case - start with an empty queue and add animations dynamically.

rec/BiblioPixel,ManiacalLabs/BiblioPixel,rec/BiblioPixel,rec/BiblioPixel,ManiacalLabs/BiblioPixel,ManiacalLabs/BiblioPixel,ManiacalLabs/BiblioPixel,rec/BiblioPixel