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由 Abhishek Kona 提交于
Summary: If the vector returned by GetUpdatesSince is empty, it is still returned to the user. This causes it throw an std::range error. The probable file list is checked and it returns an IOError status instead of OK now. Test Plan: added a unit test. Reviewers: dhruba, heyongqiang Reviewed By: heyongqiang CC: leveldb Differential Revision: https://reviews.facebook.net/D9771
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