Handle malformed progress in learning-path analytics

[ionfwsrijan]

Problem

GET /api/learning-path/<path_id>/analytics returns HTTP 500 when stored progress contains a malformed value. create_path/update_path accept arbitrary client JSON, so a non-dict progress value (e.g. a string or list) makes stats.get(...) raise AttributeError, which the except (ValueError, TypeError) clause does not catch. A non-dict progress container also breaks progress.items().

Fix

In src/routes/main_routes.py analytics handler:

• Coerce a non-dict progress container to {} so .items() cannot crash.
• Add AttributeError to the caught exceptions so a malformed per-project stats value is skipped instead of 500-ing.

Files changed

• src/routes/main_routes.py
• tests/test_learning_path.py

Testing

• New TestPathAnalyticsRoute tests: analytics returns 200 for a string stats value, a list progress container, and a valid payload (previously 500 for the first two).
• tests/test_learning_path.py: 51 passed.

Closes #1861

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