Media: When an image does not have all image sizes available, make sure we...

Media: When an image does not have all image sizes available, make sure we insert the requested size into the editor. props koopersmith. fixes #22693.



git-svn-id: https://core.svn.wordpress.org/trunk@23008 1a063a9b-81f0-0310-95a4-ce76da25c4cd