Changes since RC3:
  o #873362 Fix to missing argument error on older versions of panels
  o #620304 Tabs panel can now provide title for panel

Changes since RC2:
  o #869410: Do not display tabs panel when all tabs are empty.
  o #865922: Update to work fully with panels 3.7(3)

Changes since RC1:
  o #865922 by smoothify: Update to work fully with panels 3.7(2)

Changes since last beta:
  o #865922 by smoothify: Update to work fully with panels 3.7