ripple: TypeError on some components

[ngraef]

After the recent refactor (e92dd26), checkbox, switch, and icon button ripples are broken. Other buttons, tabs, and select/menu item ripples still work.

Interacting with the broken elements gives

Uncaught TypeError: Cannot read property 'prop' of null

at ripple.js line 144.

cc: @robertmesserle

[stewones]

+1
here with md-menu

[sincraianul]

+1 same as @stewones

[Reklino]

Yep. Same issue.

I'm also having an issue where the ripples on other buttons are now out of place. The ripples seem to be originating from below the button and to the right. Not sure if it is related or not, but the issue seemed to start at the same time.

[rbluethl]

same issue on (md-icon inside) md-button

[ngraef]

Looks like this was fixed by be4311a.