修复getStatistics函数 #12
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项目初始化时statistics表为空，添加判断语句，在无相关记录情况下进行初始化，答题人数为0，总累计分为0
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项目初始化时statistics表为空，添加判断语句，在无相关记录情况下进行初始化，答题人数为0，总累计分为0