Make AphrontErrorView work on devices

Summary:
This is the last Paste UI element that doesn't work properly on tablets/phones. Make it flexible.

Also add empty states to Paste.

Test Plan: Viewed various errors, and `/uiexample/errors/`.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D3429

src/applications/project/controller/PhabricatorProjectCreateController.php

@@ -105,11 +105,6 @@ final class PhabricatorProjectCreateController
           ->setValue($profile->getBlurb()));
 
     if ($request->isAjax()) {
-
-      if ($error_view) {
-        $error_view->setWidth(AphrontErrorView::WIDTH_DIALOG);
-      }
-
       $dialog = id(new AphrontDialogView())
         ->setUser($user)
         ->setWidth(AphrontDialogView::WIDTH_FORM)