[BhargavBhalodiya04]

Description

Fixes an unhandled CourseOutlineData.DoesNotExist (or LearningContext.DoesNotExist) exception in CourseNavigationBlocksView.filter_inaccessible_blocks() which causes GET /api/course_home/v1/navigation/<course_key> to respond with an HTTP 500 server error during the window between a course publish and when the CMS worker finishes writing the learning sequences outline to the database.

When the learning sequences outline is not yet available, this change catches CourseOutlineData.DoesNotExist and gracefully returns the course blocks without filtering rather than failing with a 500 error, mirroring the fallback behavior used by OutlineTabView.

Fixes #39116

Supporting information

• GitHub Issue: Bug: course_home/v1/navigation 500s until the CMS worker rewrites the learning_sequences outline #39116

Testing instructions

1. Call GET /api/course_home/v1/navigation/<course_key> for a course where the learning sequences outline does not exist in the database (e.g. immediately after a publish before the CMS worker task runs).
2. Verify that the endpoint returns HTTP 200 with the course navigation block tree (unfiltered) instead of HTTP 500.

Deadline

None

AI Disclosure

This PR was prepared with AI assistance (Claude Code) and reviewed and verified by the contributor.

🤖 Generated with Claude Code

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[mphilbrick211]

Hi and welcome, @BhargavBhalodiya04! In order for your CLA check to turn green, you'll need to submit a CLA form. If you are contributing as an individual, please fill out the individual CLA form here.

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Please let me know if you have any questions. Thanks!