getExtent consider null
getExtent consider null

willseeyou/echarts,apache/incubator-echarts,hexj/echarts,starlkj/echarts,ecomfe/echarts,ecomfe/echarts,benjaminbecktg/echarts,starlkj/echarts,hexj/echarts,apache/incubator-echarts,xiayz/echarts,willseeyou/echarts,benjaminbecktg/echarts,100star/echarts,chenfwind/echarts,100star/echarts,willseeyou/echarts,chenfwind/echarts,hexj/echarts,benjaminbecktg/echarts,xiayz/echarts,starlkj/echarts