fix(canvas): fix unexpected `none` or `null` value for ctx.strokeStyle & ctx.fillStyle#784

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pissang merged 2 commits into

fix-css-warning

Jul 15, 2021

Commits on Jul 12, 2021

fix(canvas): fix unexpected `none` or `null` value for ctx.strokeStyle & ctx.fillStyle, resolves apache/echarts#15238.
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Commits on Jul 15, 2021

fix(canvas): check if stroke/fill color is valid before setting strokeStyle/fillStyle.
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