请求封装：空参早退的错误日志

-- 错误：参数缺失一路传到底才炸
function requestPay(channel, price)
    deepPay(channel, price)
end

local function requestPay(channel, currencyID, price)
    if channel == nil or channel == "" then
        showTip("支付方式缺失")
        return false
    end
    if currencyID == nil or price == nil then
        showTip("支付参数缺失")
        return false
    end
    startPay(channel, currencyID, price)
    return true
end