md-radio: animation is triggered without state change

[Nightapes]

Bug, feature request, or proposal:

Bug or proposal

What is the expected behavior?

When clicking on a radio with a shorter label, the click animation is triggered and the state is changed or the animation is not triggered.

What is the current behavior?

When clicking on a radio with short label, the click animation is triggered, but the state is not changed.

What are the steps to reproduce?

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

Tested with Chrome and https://material.angular.io/components/component/radio

[jelbourn]

Probably same cause as #2783

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