fix a ZeroDivisonError when cumulative_size is zero#1

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EPiC-APOC wants to merge 4 commits intoafq984:masterfrom

EPiC-APOC:master

Commits on Dec 21, 2016

A conflict file entry in the WINDOWS operating system
Alex_Dv
committed

Commits on Dec 27, 2016

Commits on Jan 18, 2019

Merge pull request #1 from AlexandrDragunkin/master
EPiC-APOC
authored