Fix #385 - Avoid a division by 0 in handleScroll.
Fix #385 - Avoid a division by 0 in handleScroll.

cheminfo/SlickGrid,fortesl/SlickGrid,lgsunnyvale/eFinancialModel,Medisapiens/SlickGrid,jesenko/SlickGrid,songyaos/SlickGrid,codexp/SlickGrid,Revionics/SlickGrid,FactLook/SlickGrid,peaceboy/SlickGrid,helin16/SlickGrid,K2InformaticsGmbH/SlickGrid,ddomingues/X-SlickGrid,cheminfo/SlickGrid,zamabraga/SlickGrid,Celebio/SlickGrid,jiangzhixiao/SlickGrid,songyaos/SlickGrid,werture07/SlickGrid,mindmatters/SlickGrid,tradingtechnologies/SlickGrid,dynamicaction/SlickGrid,coatue/SlickGrid,pirasis-l/SlickGrid,Termato/SlickGrid,ceanota/SlickGrid,benjaminRomano/bd-SlickGrid,TedDBarr/SlickGrid,jiangzhixiao/SlickGrid,dandy/SlickGrid,dynamicaction/SlickGrid,nagasudhirpulla/SlickGrid,msuchoi/Coffee,redabakr/SlickGrid,RobertoMalatesta/SlickGrid,dbirchak/SlickGrid,priyaaanand/SlickGrid,csgsolutions/SlickGrid,gofflab/neuron-seq-site,concord-consortium/codap-SlickGrid,ceanota/SlickGrid,dbirchak/SlickGrid,doctor41/SlickGrid,steelsojka/SlickGrid,zartata/SlickGrid,GerHobbelt/SlickGrid,FactLook/SlickGrid,SimplGy/SlickGrid,TedDBarr/SlickGrid,dandy/SlickGrid,Termato/SlickGrid,mindmatters/SlickGrid,thationothe/SlickGrid,lanwan/SlickGrid,cheminfo/SlickGrid,priyaaanand/SlickGrid,chrisghost/X-SlickGrid,matrix1992/SlickGrid,steelsojka/SlickGrid,zamabraga/SlickGrid,coatue-oss/slickgrid2,6pac/SlickGrid,fortesl/SlickGrid,codexp/SlickGrid,redabakr/SlickGrid,GerHobbelt/SlickGrid,coatue-oss/slickgrid2,msuchoi/Coffee,doctor41/SlickGrid,vinicius5581/SlickGrid,GerHobbelt/SlickGrid,helin16/SlickGrid,iCoreSolutions/SlickGrid,gbark/SlickGrid,Infowatch/SlickGrid,yamass/SlickGrid,thationothe/SlickGrid,werture07/SlickGrid,RobertoMalatesta/SlickGrid,pandell/SlickGrid,matrix1992/SlickGrid,yamass/SlickGrid,jesenko/SlickGrid,tradingtechnologies/SlickGrid,manju-reddys/SlickGrid,trazyn/SlickGrid-mini,nagasudhirpulla/SlickGrid,gofflab/neuron-seq-site,6pac/SlickGrid,peaceboy/SlickGrid,msuchoi/Coffee,ddomingues/X-SlickGrid,SimplGy/SlickGrid,coatue/SlickGrid,gofflab/neuron-seq-site,varunkumar/slickgrid-mleibman,vinicius5581/SlickGrid,Infowatch/SlickGrid,mleibman/SlickGrid,gofflab/neuron-seq-site,trazyn/SlickGrid-mini,manju-reddys/SlickGrid,msuchoi/Coffee,csgsolutions/SlickGrid,Revionics/SlickGrid,chrisghost/X-SlickGrid,zartata/SlickGrid,coatue/SlickGrid,JLynch7/SlickGrid,pandell/SlickGrid,JonBons/SlickGrid-DraggableGrouping-SummaryFooters,lanwan/SlickGrid,cjsigler/SGrid,benjaminRomano/bd-SlickGrid,mleibman/SlickGrid,iCoreSolutions/SlickGrid