bug: npm pkghallu detector missing date field

[leondz]

date field has invalid content for javascript/npm package hallucination detector

detector can generator log entries like these when parsing the dataset:

2026-01-15 12:02:28,001  WARNING  Invalid package date format: Invalid isoformat string: 'Error: 404 Client E'. Keeping package @zalastax/nolb-_6 with unknown creation date
2026-01-15 12:02:28,001  WARNING  Invalid package date format: Invalid isoformat string: 'Error: 404 Client E'. Keeping package @zalastax/nolb-_a8 with unknown creation date
2026-01-15 12:02:28,001  WARNING  Invalid package date format: Invalid isoformat string: 'Error: 404 Client E'. Keeping package @zalastax/nolb-1g with unknown creation date
2026-01-15 12:02:28,001  WARNING  Invalid package date format: Invalid isoformat string: 'Error: 404 Client E'. Keeping package @zalastax/nolb-_abp with unknown creation date
2026-01-15 12:02:28,001  WARNING  Invalid package date format: Invalid isoformat string: 'Error: 404 Client E'. Keeping package @zalastax/nolb-_abd with unknown creation date
2026-01-15 12:02:28,001  WARNING  Invalid package date format: Invalid isoformat string: 'Error: 404 Client E'. Keeping package @zalastax/nolb-_abh with unknown creation date
2026-01-15 12:02:28,001  WARNING  Invalid package date format: Invalid isoformat string: 'Error: 404 Client E'. Keeping package @zaidan-ui/core with unknown creation date
2026-01-15 12:02:28,001  WARNING  Invalid package date format: Invalid isoformat string: 'Error: 404 Client E'. Keeping package @zalastax/nolb-_aj with unknown creation date
2026-01-15 12:02:28,001  WARNING  Invalid package date format: Invalid isoformat string: 'Error: 404 Client E'. Keeping package @zalastax/nolb-_ab- with unknown creation date
2026-01-15 12:02:28,001  WARNING  Invalid package date format: Invalid isoformat string: 'Error: 404 Client E'. Keeping package @zalastax/nolb-19 with unknown creation date
2026-01-15 12:02:28,001  WARNING  Invalid package date format: Invalid isoformat string: 'Error: 404 Client E'. Keeping package @zalastax/nolb-17 with unknown creation date
2026-01-15 12:02:28,001  WARNING  Invalid package date format: Invalid isoformat string: 'Error: 404 Client E'. Keeping package @zalastax/nolb-_air with unknown creation date
2026-01-15 12:02:28,001  WARNING  Invalid package date format: Invalid isoformat string: 'Error: 404 Client E'. Keeping package @zalastax/nolb-_aba with unknown creation date
2026-01-15 12:02:28,001  WARNING  Invalid package date format: Invalid isoformat string: 'Error: 404 Client E'. Keeping package @zalastax/nolb-13 with unknown creation date
2026-01-15 12:02:28,001  WARNING  Invalid package date format: Invalid isoformat string: 'Error: 404 Client E'. Keeping package @zalastax/nolb-_abf with unknown creation date
2026-01-15 12:02:28,001  WARNING  Invalid package date format: Invalid isoformat string: 'Error: 404 Client E'. Keeping package @zalastax/nolb-_aby with unknown creation date

• dataset creation script should be amended
• dataset on hf hub should be updated