Attempting to list collections for a non-existent repo/distro results in 500 ISE

Description

Attempting to list collections for a non-existent repo/distro results in 500 ISE

Key Dependency Versions

galaxy-importer==0.4.10
galaxy-ng==4.7.0
pulp-ansible==0.17.0
pulp-container==2.14.5
pulp-glue==0.19.0
pulpcore==3.23.3

Steps to Reproduce

Call /api/galaxy/v3/plugin/ansible/content/i_dont_exist/collections/index/

Actual Behavior

500 ISE

Expected Behavior

404?