fix(lines): lines series shouldn't disappear after `setOption({})`. (#12836)#12850

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pissang merged 1 commit intoapache:masterfrom plainheart:fix-lines-mergeOption-12836

Aug 4, 2020

+104-3

Commits on Jun 23, 2020

fix(lines): lines series shouldn't disappear after setOption({}), fix apache#12836 .
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