'Today' fails on plain datepicker control

[mnaoumov]

I have a page with different controls

one of them is plain jQuery datePicker $('elem1').datepicker();

If I click 'Today' button it fails in $.datepicker._gotoToday method because tp_inst is undefined in that case.
Additional check for that case should be added.

Regards,

[trentrichardson]

Thanks for the catch. I added a check for this in the dev branch