Merge pull request #13067 from dataease/pr@dev-v2@chart-t-heatmap-fix

fix(图表): 修复热力图缺少颜色字段时，图表显示报错的问题

core/core-frontend/src/views/chart/components/views/index.vue

@@ -627,7 +627,7 @@ const checkFieldIsAllowEmpty = (allField?) => {
       if (
         !value['allowEmpty'] &&
         value['limit'] &&
-        view.value?.[key]?.length < parseInt(value['limit'])
+        (!view.value?.[key] || view.value?.[key]?.length < parseInt(value['limit']))
       ) {
         showEmpty.value = true
         return false