Polymer/core-animation — pull request #8 by jeffposnick (2014-10-27 20:09:17+00:00)
Title: Ensure this.shadowRoot isn't null

There are some scenarios in which you aren't immediately providing a `customEffect` (because it's being set dynamically later) and there are no `` children, so there won't be a `shadowRoot`. This prevents `this.shadowRoot.querySelectorAll()` from throwing a runtime exception.