- fixed dependencies and graph on empty data

package.json

@@ -11,6 +11,7 @@
   "dependencies": {
     "async": "^2.1.4",
     "body-parser": "^1.16.1",
+    "bootstrap": "^4.0.0-alpha.6",
     "chart.js": "^2.5.0",
     "css-loader": "^0.26.1",
     "ejs": "^2.5.5",
@@ -25,6 +26,7 @@
     "send": "0.14.2",
     "sequelize": "^3.30.2",
     "sqlite3": "^3.1.8",
+    "sweetalert2": "^6.4.2",
     "tether": "^1.4.0",
     "vue": "^2.1.10",
     "vue-loader": "^11.0.0",

webSource/servergraph.vue

@@ -144,6 +144,9 @@ var generateTemplate = function(){
           if (req.readyState == XMLHttpRequest.DONE &&
             req.status === 200) {
               var obj = JSON.parse(req.response);
+              if(obj.length <= 0){
+                return -1;
+              }
               self.graphdata.datasets[0].data = [];
               self.graphdata.datasets = [];
               var firstStamp = new Date(obj[0].createdAt);