LineChartRenderer context bug
LineChartRenderer context bug

In the LineChartRenderers drawLinear method the Context gets saved, but
if there is no data to display it never gets restored.

This causes other components to disappear.

This commit fixes this by saving the context after the check for data
to display.

StephenVinouze/ios-charts,jum/Charts,liuxuan30/Charts,ConcepterDev/ios-charts,Shannon-s-Dreamland/Charts,SBGMobile/Charts,icecrystal23/ios-charts,dtrauger/Charts,leoMehlig/ios-charts,hanquochan/Charts,FreddyZeng/Charts,koroff/Charts,leoMehlig/Charts,GreenCom-Networks/ios-charts,GreenCom-Networks/ios-charts,leoMehlig/Charts,jum/Charts,franqueli/ios-charts,liuxuan30/Charts,LiveHappier/Charts,Shannon-s-Dreamland/Charts,liuxuan30/ios-charts,danielallsopp/Charts,hanquochan/Charts,danielgindi/ios-charts,gjpc/ios-charts,danielgindi/ios-charts,summerlove57/ios-charts,duanhjlt/ios-charts,SBGMobile/Charts,SBGMobile/Charts,duanhjlt/ios-charts,hanquochan/Charts,GreenCom-Networks/ios-charts,jjatie/Charts,MAARK/Charts,MAARK/Charts,gjpc/ios-charts,SereivoanYong/Charts,hanquochan/Charts,Eflet/Charts,liuxuan30/ios-charts,Eflet/Charts,StephenVinouze/ios-charts,jesseXu/Charts,leoMehlig/Charts,boluomeng/Charts,duanhjlt/ios-charts,leoMehlig/Charts,MAARK/Charts,shujucn/ios-charts,jesseXu/Charts,jesseXu/Charts,aelam/Charts,mobistix/ios-charts,gjpc/ios-charts,mobistix/ios-charts,franqueli/ios-charts,StephenVinouze/ios-charts,ekohe/ios-charts,leoMehlig/ios-charts,icecrystal23/ios-charts,boluomeng/Charts,jum/Charts,boluomeng/Charts,icecrystal23/ios-charts,SereivoanYong/Charts,LiveHappier/Charts,FreddyZeng/Charts,ekohe/ios-charts,mobistix/ios-charts,dtrauger/Charts,koroff/Charts,liuxuan30/Charts,jum/Charts,SereivoanYong/Charts,koroff/Charts,aelam/Charts,liuxuan30/Charts,jjatie/Charts,liuxuan30/ios-charts,danielgindi/Charts,GreenCom-Networks/ios-charts,ConcepterDev/ios-charts,Eflet/Charts,danielgindi/ios-charts,jjatie/Charts,convergeeducacao/Charts,danielallsopp/Charts,FreddyZeng/Charts,leoMehlig/ios-charts,leoMehlig/ios-charts,danielgindi/ios-charts,summerlove57/ios-charts,summerlove57/ios-charts,MAARK/Charts,aelam/Charts,shujucn/ios-charts,koroff/Charts,ConcepterDev/ios-charts,shujucn/ios-charts,convergeeducacao/Charts,Eflet/Charts,StephenVinouze/ios-charts,jjatie/Charts,dtrauger/Charts,danielgindi/Charts,danielgindi/Charts,liuxuan30/ios-charts,boluomeng/Charts,icecrystal23/ios-charts,ekohe/ios-charts,dtrauger/Charts,FreddyZeng/Charts,danielgindi/Charts,franqueli/ios-charts,LiveHappier/Charts