Phurl URL object should show a banner if the URL is invalid
Summary: Ref T8989, Phurl URL should always show an info banner if the URL isn't valid
Test Plan: Phurl objects with URL "google.com" should show an error banner, but objects with URL "http://google.com" should not show banner.
Reviewers: epriestley, Blessed Reviewers
Reviewed By: epriestley, Blessed Reviewers
Subscribers: Korvin
Maniphest Tasks: T8989
Differential Revision: https://secure.phabricator.com/D14386