TypeError upon logging in to a user without an ExpressSearchConfig app resource

[grantfitzsimmons]

Describe the bug
Users who do not have an ExpressSearchConfig app resource will experience an error toast immediately upon logging into production as of c75cf54.

TypeError at /context/available_related_searches.json cannot unpack non-iterable NoneType object Request Method: GET Request URL: http://localhost/context/available_related_searches.json 

To Reproduce
Steps to reproduce the behavior:

1. Go to App Resources
2. Filter all resources until you only see "Express Search Config"s
3. Delete any ExpressSearchConfig app resource associated with your current user
4. Log out or clear your cache
5. See the error toast

Expected behavior

It should use the default express search config resource.

Crash Report

Specify 7 Crash Report - 2024-12-12T21_53_32.665Z.txt

Encountered on the geo_swiss instance as well as on a local copy of eurl
macOS, Vivaldi

This does not happen on v7.9.6.2