message: ensure icon is unset if not processed
diff: @@ -213,6 +213,9 @@ func chartVersionAttributes(cid string, cv models.ChartVersion) models.ChartVers
  func chartAttributes(c models.Chart) models.Chart {
  if c.RawIcon != nil {
  c.Icon = "/v1/assets/" + c.ID + "/logo-160x160-fit.png"
  + } else {
  + // If the icon wasn't processed, it is either not set or invalid
  + c.Icon = ""
  }
  return c
  }
  