slider thumb disappearing on click

[swseverance]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

For a disabled slider, clicking on the slider thumb should produce no visible change or response from the end user's perspective.

What is the current behavior?

When a slider is in the disabled state, but has the "thumbLabel" directive applied, clicking the slider thumb causes it to disappear (it's height and width get set to zero). When a slider is in the disabled state, but DOES NOT have the "thumbLabel" directive applied, clicking the slider thumb causes no visible change.

What are the steps to reproduce?

Plunker template: https://embed.plnkr.co/1VhilOrV68SKzhjb6i7z/

What is the use-case or motivation for changing an existing behavior?

N/A

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

@angular/material@2.0.0-beta.8

Is there anything else we should know?

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