empty start on graph

src/ui/PurchaseGraph.vue

@@ -19,34 +19,34 @@ export default {
       _response = await fetch("/api/purchase/statistics");
     }
     let response = await _response.json();
-    let labels = [];
+    let labels = [""];
     let blue = {
       label: "Blå",
       borderColor: "#57d2fb",
       backgroundColor: "#d4f2fe",
       borderWidth: 2,
-      data: []
+      data: [0]
     };
     let yellow = {
       label: "Gul",
       borderColor: "#ffde5d",
       backgroundColor: "#fff6d6",
       borderWidth: 2,
-      data: []
+      data: [0]
     };
     let red = {
       label: "Rød",
       borderColor: "#ef5878",
       backgroundColor: "#fbd7de",
       borderWidth: 2,
-      data: []
+      data: [0]
     };
     let green = {
       label: "Grønn",
       borderColor: "#10e783",
       backgroundColor: "#c8f9df",
       borderWidth: 2,
-      data: []
+      data: [0]
     };
 
     let highestNumber = 0;
@@ -87,7 +87,7 @@ export default {
         title: {
           display: true,
           text: "Antall kjøpt",
-          fontSize: 20,
+          fontSize: 20
         },
         legend: {
           display: true,