Cannot set bb-datepicker with string in format: 'yyyy-mm-dd'

[Blackbaud-SarahMalick]

Expected behavior

We should be able to use 'yyyy-mm-dd' format to set a datepicker field (instead of just 'MM/dd/yyyy') when no format is specified.

Actual behavior

Console error logged when setting datepicker with 'yyyy-mm-dd'.

Steps to reproduce

1. Open the console on the plunker page.
2. Use the datepicker to choose any date.
3. Click save.
4. Notice that a console error has been logged (TypeError: Cannot read property 'length' of undefined)

Plunker

http://plnkr.co/edit/PR3vmRcAZsY5FO4FEac2?p=preview