Do not let wrongly repeatable 008 field break the date mapping

[TobiasNx]

2026-02-07 14:34:16 [WARN] org.lobid.resources.ElasticsearchIndexer in Thread-13 - Bulk insert failed: failure in bulk execution:
[2956]: index [resources-alma-fix-20260207-1355], type [resource], id [99375197491606441], message [MapperParsingException[failed to parse [publication.endDate]]; nested: IllegalArgumentException[Invalid format: "240201c20249999nyuuu d oeb   0    2eng d" is malformed at "c20249999nyuuu d oeb   0    2eng d"];]
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