Control gets stuck when callback function triggered with empty array

[a-yakimov]

Hello @yuku-t ,

Let me first thank you for this nice control. It's a great work.

I bumped into an issue recently that brings control into unresponsive state.
When callback function is triggered from a strategy.search function with an empty array, then control throws an error in dropdown.render(zippedData) function. I was able to pass the check "if (this.data.length) { in line 449" and after control expects that array zippedData should have at least one element and rely that first element will have a strategy property. This error related to version 1.3.3.

Thank you,
Alex