Dataset without files are incorrectly labeled as `info:eu-repo/semantics/openAccess` within exports

• What steps does it take to reproduce the issue?

  Create a dataset in Dataverse without uploading any files due to the sensitivity of the data (e.g., patient-level data).
  (Apply a custom license that restricts access to the dataset.)[This has no effect on this property.]
  Export the dataset metadata using the XmlMetadataTemplate or OpenAireExportUtil. (Datacite or openAIRE)
  Check the exported metadata and observe that the access type is incorrectly labeled as info:eu-repo/semantics/openAccess.

• When does this issue occur?

  This issue occurs during the metadata export process for datasets without uploaded files. The relevant code to place another value within the export depends on the presence of a file cf. method .

• Which page(s) does it occur on?
  This issue affects the metadata export functionality and is not directly tied to a specific UI page but impacts the exported files and integrations.

• What happens?

  The export incorrectly includes info:eu-repo/semantics/openAccess in the metadata. A dataset without a file is not automatically openAccess, as means to access them are defined within custom terms.

• To whom does it occur (all users, curators, superusers)?

  This issue affects all users who rely on metadata exports, including administrators, curators, and external systems consuming the exported metadata.

• What did you expect to happen?

  The export should reflect the correct access status of the dataset or if not known omit this property.

• Which version of Dataverse are you using?

  6.5

• Any related open or closed issues to this bug report?

  https://github.com/IQSS/dataverse/issues/5920

• Are you thinking about creating a pull request for this issue?

  We welcome contributions to this issue.

Start in OpenAireExportUtil.java around the linked method at line 1067, then trace how XmlMetadataTemplate and OpenAIRE or Datacite exports determine access status. Reproduce the export for a dataset with no files and a restrictive custom license. Done means the export no longer labels such a dataset as openAccess when that status is not justified.