[Bug] Crash when image does not exist

[sk2andy]

Describe the bug When you remove an image I a file manager that paperize wants has in a collection the app crashes way more often

To Reproduce Steps to reproduce the behavior:

1. Add image to collection
2. Enable collection to show as any background
3. Delete the image
4. App crashes when the next wallpaper change occurs

Expected behavior Simply go to the next image

Screenshots If applicable, add screenshots to help explain your problem.

Smartphone (please complete the following information):

• Device: pixel 8
• OS: android 16

Additional context The app crashes very frequently on my phone. I am not sure if that's the only or problem