Preprint and article link (ing.grid development work): Hide link for unpublished preprints

[mattiker]

The journal site is showing a link to the preprint server even if the item there is unpublished, see: https://www.inggrid.org/article/id/3932/ (ID 28 on the preprintserver). The link leads to a "page not found" because the preprint version is not published.

Context: Some articles are published on an invitation-only basis without peer review ("data management letter"). Submissions for the journal are disabled, all articles must be submitted at the preprint server. But a preprint for this kind of article is not needed.

Maybe the link can be hidden for articles with unpublished preprints?