Images disappear in an album after editing

Problem/Motivation

Images disappear in an album after editing. On the Edit form, there is no default value in "Add image(s) to an album" so after saving the value is lost so the entity lost its album.

Steps to reproduce

1. Create an album, and add images there
2. Click on the Edit option from the drop-down on an image
3. Click on the "Post" button on the album edit form

Proposed resolution

On the edit form except of "none" and "Create new album" keep the default value for "Add image(s) to an album" field.