Avoid empty onchange event in Date Range

[chepelevdi]

Hey.

The problem in Date Range is that it fires onChange callback after first render with empty data, but it should fires it only after confirm the calendar. That is why users of the component have to use a lot of additional ifelse checks.

My code prevents first invoke of onChange, and this resolves all issues.

[juliewongbandue]

This makes sense to me. I did a quick search in Vimeo/vimeo and it looks like the other places that this is used would benefit from this change as well. Though unlikely, I am still slightly concerned that there might be somewhere else this is implemented where the onChange is expected to be called on first render. We should definitely test this thoroughly before upgrading in the platform.