Notice & Warning on first media upload

Every first media upload into a empty gallery produces a notice, followed by a warning.

Notice: Undefined index: und in media_gallery_add_images() (line 264 of [...]\sites\all\modules\media_gallery\media_gallery.pages.inc).
Warning: Invalid argument supplied for foreach() in media_gallery_add_images() (line 265 of [...]\sites\all\modules\media_gallery\media_gallery.pages.inc).

The reason is, that the media_gallery_media property is empty.

Patch applied, tested on a fresh installation.