fix: do not allow empty data to be saved. for area manager

zhangzengfei

2020-09-01 59ad7ba6452b2028fd7faca000c626a148256620

 package.json

@@ -14,6 +14,7 @@
    "echarts": "^4.8.0",
    "echarts-liquidfill": "^2.0.6",
    "element-ui": "^2.13.2",
    "heatmap.js": "^2.0.5",
    "html2canvas": "^1.0.0-rc.5",
    "less-loader": "^6.2.0",
    "moment": "^2.27.0",