Empty select causes crash

[Hugo Vacher]

When called on a <select> with no <option/> tags dropkick causes an unhandled error:

Uncaught TypeError: Cannot read property 'className' of undefined

I know it is not something that should happen, but it can be pretty anoying as it kills any remaining javascript on the page.

[Robert DeLuca]

Thanks for the issue! I'd like to handle this error a little better so it doesn't lill the rest of the JS on the page. Hopefully there will be time over the holiday break to take care of this :P