mat-select demo's native select reset is broken

[DrJKL]

Bug, feature request, or proposal:

native html select reset doesn't work in the demo.
https://material.angular.io/components/select/overview#resetting-the-select-value

What is the expected behavior?

In the native select example:
Selecting a car, then selecting the blank top should reset the form field.

What is the current behavior?

The blank option is unselectable

Is there anything else we should know?

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