mdInput warning: The specified value "" does not conform to the required format. The format is "#rrggbb" where rr, gg, bb are two-digit hexadecimal numbers.

[alexsapps]

Bug: using mdInput prints warning in javascript console:

features.js:30 The specified value "" does not conform to the required format. The format is "#rrggbb" where rr, gg, bb are two-digit hexadecimal numbers.

It is due to testing if "color" input type is supported:
https://github.com/angular/material2/blob/master/src/lib/core/platform/features.ts#L10

The warning can be seen visiting this page:
https://material.angular.io/components/component/input

I'm on Chrome 56.0.2924.76 (64-bit)

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