feat: 增强判断

src/views/stationData/component/newDataChart.vue

@@ -117,7 +117,7 @@ const chartOption = computed<EChartsOption>(() => {
       data: entry.map(([ts, val]) => {
         const coef = legend?.coefficient ? new Big(legend.coefficient) : new Big(1)
         const operator = legend?.operator || '*'
-        let valBig = new Big(val)
+        let valBig = new Big(val ?? 0)
         if (operator === '/') {
           valBig = valBig.div(coef)
         } else {