[FIX] dataviz.js - divison by 0
[FIX] dataviz.js - divison by 0

Kendearoth/HyblabDDJ2017,mperreir/HyblabDDJ2017,ErwanFactory/HyblabDDJ2017,ErwanFactory/HyblabDDJ2017,Kendearoth/HyblabDDJ2017,mperreir/HyblabDDJ2017