Lunny Xiao c4e52d232e Fix panic when diff (#9187) (#9193) ... * fix panic when diff * improve code		2019-11-28 10:07:30 -05:00
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refs	Fix panic when diff (#9187) (#9193)	2019-11-28 10:07:30 -05:00
HEAD	Fix panic when diff (#9187) (#9193)	2019-11-28 10:07:30 -05:00