DKG-391: Bugfix None values for APC attributes in works.py

metaphacts / semopenalex

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Closed davidlamprecht closed 5 months ago

davidlamprecht commented 5 months ago

The following points are addressed:

Check for None values when creating the triples for the ArticleProcessingCharge attributes (especially work_apc_list_value_usd has many None values in the Source data).