MD-Checkbox Without Label has Different Vertical Alignment

[ijager]

Bug:

When I don't provide text between the <md-checkbox></md-checkbox> tags the vertical alignment is different then when text is provided <md-checkbox> my-text </md-checkbox>

What is the expected behavior?

I would expect that checkbox alignment does not depend on the presence of a label.

What are the steps to reproduce?

See this plunker: https://plnkr.co/edit/kbBb7a?p=preview

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

I want to use md-checkbox in a html <table>, therefore I don't need a label since the table header already takes care of that.

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

Angular RC.x, Material Alpha.6, all browsers

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