Missing back button and URL check

[kraftbj]

Originally https://core.trac.wordpress.org/ticket/32340

I tried Press This in WP admin: wp-admin/press-this.php

I added wrong URL address because there was small copy and paste error. After clicking Scan, there is no message that URL was not find/recognized. No chance to add different URL address, because URL field is away.

And there is no way how to return back to WP admin?

[kraftbj]

Possible cases of error:

• Direct method - typo'd URL
• Either method - Private URL (private site, HTTP Auth, etc).
• Either method - other server error (curl responds with something other than a site).

Perhaps a small "Error: We were not able to fetch data at the URL" and revealing the scan URL box pre-filled with what was attempted.