[HOTFIX] #512 #550 Media selection page save none exist media, media selection collection filter

 - fix save error when media not exist
 - fix all images are shown when filter for collection

__Tasks:__

- [ ] test coverage
- [ ] gather feedback for my changes


__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | yes
| Fixed tickets | fixes #512 fixes #550
| BC Breaks     | none
| Doc           | none