Bug, feature request, or proposal:

Bug

What is the expected behavior?

No uncaught typeerrors when selecting checkboxes if ripple is disabled

What is the current behavior?

When selecting or tabbing to a checkbox with [disableRipple]="true":

Uncaught TypeError: Cannot read property 'launch' of undefined
    at SafeSubscriber.eval [as _next] (material.umd.js:6095)
    . . .

What are the steps to reproduce?

http://plnkr.co/edit/YcArpxwX8fQReqj55ufU?p=preview
Open console and click the "No ripple" checkbox

Which versions of Angular, Material, OS, browsers are affected?

latest versions