Range Display - 12.0.0 fix

local function checkTarget(ud)
  local unit = ud.unit
  if not unit then return nil end

  local success, result = pcall(function()
    if not UnitExists(unit) or UnitIsUnit(unit, "player") then
      return nil
    end

    if UnitIsDeadOrGhost(unit) then
      ud.useSound = false
      return not ud.db.enemyOnly
    end

    if UnitCanAttack("player", unit) then
      ud.useSound = not mute
      return true
    elseif UnitCanAssist("player", unit) then
      ud.useSound = not mute and not ud.db.warnEnemyOnly
      return not ud.db.enemyOnly
    end

    ud.useSound = false
    return not ud.db.enemyOnly
  end)

  if success then
    return result
  else
    return true
  end
end