修复第二页无法正确返回上一页问题 #78
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修复第二页无法正确返回上一页问题 #78
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造成原因：当上一页为首页时page.prev_link为空，而url_for不接受空字符串
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造成原因：当上一页为首页时page.prev_link为空，而url_for不接受空字符串