fix: fix OAI error with non existent works mentioned in isEditionOf fields

...c/main/java/info/textgrid/middleware/OaipmhUtilities.java

...main/java/info/textgrid/middleware/RecordDelivererDC.java

...ava/info/textgrid/middleware/RecordDelivererDatacite.java

...n/java/info/textgrid/middleware/RecordDelivererIdiom.java

...info/textgrid/middleware/RecordListDelivererDatacite.java

...c/main/openaire/include/datacite-contributorType-v3.1.xsd

...h-core/src/main/openaire/include/datacite-dateType-v3.xsd

...src/main/openaire/include/datacite-descriptionType-v3.xsd

.../openaire/include/datacite-relatedIdentifierType-v3.1.xsd

.../src/main/openaire/include/datacite-relationType-v3.1.xsd

...re/src/main/openaire/include/datacite-resourceType-v3.xsd

...-core/src/main/openaire/include/datacite-titleType-v3.xsd

oaipmh-core/src/main/openaire/oaf-1.0.xsd

oaipmh-core/src/main/openaire/oaf-common-1.0.xsd

oaipmh-core/src/main/openaire/oaf-datasource-1.0.xsd

oaipmh-core/src/main/openaire/oaf-org-1.0.xsd

oaipmh-core/src/main/openaire/oaf-project-1.0.xsd

oaipmh-core/src/main/openaire/oaf-result-1.0.xsd

oaipmh-core/src/main/openaire/openaire.xsd

oaipmh-core/src/main/resources/simpledc20021212.xsd