Minimalistic fix for bubble trails #1520, #1521
Minimalistic fix for bubble trails #1520, #1521

dab2000/vizabi,Gapminder/vizabi,sergey-filipenko/vizabi,buchslava/vizabi,Gapminder/vizabi,vizabi/vizabi,sergey-filipenko/vizabi,dab2000/vizabi,buchslava/vizabi,Gapminder/vizabi,vizabi/vizabi,dab2000/vizabi,buchslava/vizabi,sergey-filipenko/vizabi