snackbar action button styling when no other md-button is used on the page

[fxck]

this happens(http://plnkr.co/edit/0x5guGIc5ofmxDyCJ7Sm?p=preview) when there are no md-buttons used on the page

when you actually use md-button on the page(http://plnkr.co/edit/oOsUEcDjIkNIi9REGxvA?p=preview), it's fine

@crisbeto maybe?

[crisbeto]

Seems weird, will look into it.

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