Do not add links to Posters or Assignees with ID < 0 (#20577) #21037
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Backport #20577
There are several places in templates/repo/issue/view_content/comments.tmpl where links are made to Posters or Assignees who are Ghosts or have IDs <0.
Fix #20559
Signed-off-by: Andrew Thornton art27@cantab.net