md-input-container in md-card makes strange warning

[alanpurple]

<md-card>
    <md-input-container>
        <input md-input type=text>
    </md-input-container>
</md-card>

this makes the following warning

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

material2 2.0.0-beta.1
angular 4.0.0-beta.7

[crisbeto]

This has been fixed by #2906.

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}