23cf88856e
extract_page_blocks() walked `record.boundary` and `record.baseline` unconditionally, so a record that arrived without either (malformed kraken output, or a MagicMock in tests that iterates to nothing) crashed with "min() arg is an empty sequence". Coerce both attributes through list(), require at least 3 points for the polygon path, fall back to the baseline path when the polygon is missing, and skip the record entirely when neither is usable — emitting no block is safer than emitting one with garbage coordinates. The test helper now sets `boundary` and `baseline` explicitly to mirror real Kraken 7.0 records (and so the happy-path test exercises the polygon branch). A new regression test covers the skip path. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>