fix(column): 修复柱状图拆分维度为空字符串时，错误显示了 xField 作为 title 的问题 (#3494)

Co-authored-by: qingmo.xwj <[email protected]>

Author: wjgogogo

src/plots/column/adaptor.ts

@@ -99,7 +99,7 @@ function geometry(params: Params<ColumnOptions>): Params<ColumnOptions> {
     ? {
         formatter: (datum: Datum) => ({
           name:
-            isGroup && isStack ? `${datum[seriesField]} - ${datum[groupField]}` : datum[seriesField] || datum[xField],
+            isGroup && isStack ? `${datum[seriesField]} - ${datum[groupField]}` : datum[seriesField] ?? datum[xField],
           value: (Number(datum[yField]) * 100).toFixed(2) + '%',
         }),
         ...tooltip,