MdSnackBar from Component auto-close, won't open

[SaturnTeam]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Opening snackbar from component without set duration and already opened from same component snackbar will appear.

What is the current behavior?

Snackbar auto close by it self, if there is no duration option

What are the steps to reproduce?

1. open bar from component
2. try to open it again
   You will see, snackbar will close and never showed again. If you have animations module, you can see how new snackbar starts to appear, and then closes.
   If you set up duration in config, everything will be fine.
   https://plnkr.co/edit/zuumORaByIHLHBKKHLse?p=preview

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