Bug: Navigation issue when going to a picture page

[lbesson]

Describe the bug Navigation issue when going to a picture page

To Reproduce Steps to reproduce the behavior:

1. Open an outing with pictures on it
2. Click on one of the pictures
3. Click on the "eye" button to go on the picture page
4. Navigate back

You get a page in the form /outings/xxx/undefined/ and a 400 error banner

Expected behavior No error, and previous page properly displayed