Directory fails to load if asset not available on pretty path

[expede]

Summary

Problem

When the pretty links are broken, Drive fails to load the directory with the related content. Issue persists when wiping Drive data from browser setting, and trying with fresh login.

Side topic: I should also note that it's odd that the /p/ is not generated, and that Drive is looking for a path at /pretty/

Impact

Unable to use portions of Drive

Solution

I assume that this is failing because it can't grab a preview image? In that case, fail gracefully with a "no preview", or use the userland path instead.

Detail

Describe the bug

Unable to load directory when any links are broken.

To Reproduce
Steps to reproduce the behavior:

1. Go to drive.fission.codes
2. Sign in
3. Click on Public
4. Upload a bunch of images
5. Wait for uploads to report completed
6. Navigate away
7. Return to Public
8. Unable to load page with a "get me out of here" button

Expected behavior
Can load directory

Screenshots

Desktop (please complete the following information):

• OS: macOS 11.2.3
• Browser Firefox
• Version 87.0

[icidasset]

To do:

1. Figure out why the /p path is missing and fix that
2. Make it fall back to /public/.../userland

[expede]

I'd also suggest

3. Fall back to "no preview available" if userland is missing

Yes that's another state for the FE to handle (either Err or Nothing), but lowering the blast radius is a good idea.