[BUG] Missing areas in structure.json files

[dbirman]

Describe the bug
Some of the atlases have areas in the annotation volume that don't appear in the structure.json file. It would be great to add the missing annotations by following up with the original uploaders/authors of the atlas or at a minimum just putting in some generic metadata to make it clear that the structure is unknown.

[adamltyson]

Hi @dbirman, thanks for raising this. I think this has two parts:

• Preventing this on the atlas generation side - Create validator script to ensure packaged atlas meet certain criteria (maybe also with an option to display images for a visual check?) #217
• Adding some check on the API side to inform users