Gallery preview is busted if all images are deleted

[apeatling]

Running r22327 on Chrome 22.0.1229.94.

Issue:

Using the new media UI -- when I insert a gallery into a post, then go ahead and delete all of the images from the media library, the gallery preview is busted. It shows an empty preview graphic that can't be edited in any way.

To reproduce:

1. Start a new post.
2. Using the new media UI, add some images and create-insert a new gallery.
3. Head to the media page and delete all the images that were added to the gallery
4. Edit the post, the gallery preview is busted.

[MikeHansenMe]

screenshot of the problem

[koopersmith]

In 22567:

Media: Restore 3.4 editor behavior and remove TinyMCE views.

• Reactivates the wpgallery and wpeditimage TinyMCE plugins. Deactivates the wpviews TinyMCE plugin.
• Moves still-relevant logic from mce-views.js to media-upload.js and shortcode.js.
• No longer include wp-includes/js/mce-views.js. This code will not be used in 3.5, and should be considered unstable.
• Currently, this is the real 3.4 experience; as such, editing triggers the old modals. Changing this is the next major step.

When reassessing views, we should look over all of these tickets and anticipate these bugs accordingly.

fixes #21813, #22123, #22155, #22161, #22257, #22266, #22318, #22407, see #21390.