Instagram placeholder shows 404 in preview

[sillygwailo]

http://instagram.com/p/bWaCmcghHO/ is a valid Instagram URL, but if I were to do the following:

1. visit http://embedresponsively.com/
2. click on "Instagram"
3. click on "Embed" without pasting anything in

It shows:

[jeffehobbs]

Yeah, but why wouldn't you paste something in? I guess I should add a better error handler there when the input is blank, but this has a "doctor it hurts when I do this" feel. :)

[sillygwailo]

Because when you visit embedresponsively.com for the first time, it looks like there's a URL in the text box. Yes, it's greyed out, but it seemed to me like an example that you could actually try out. Wouldn't it be nice to see a preview of it in action if you don't have a specific URL in mind? So in addition to error handling (maybe the URL doesn't exist because they mistakenly typed in something after pasting), have clicking the button use the example URL that's greyed out to show what happens.