Comment 1 for bug 1933705

Yep, that's a bug.

func combinedRevision(r resource.Resource) string {
 switch r.Origin {
 case charmresource.OriginStore:
  // Have to check since 0+ is a valid revision number
  if r.Revision >= 0 {
   return fmt.Sprintf("%d", r.Revision)
  }
 case charmresource.OriginUpload:
  if !r.Timestamp.IsZero() {
   return r.Timestamp.Format("2006-02-01T15:04")
  }
 }
 return "-"
}