Unload chart data before loading new one.

src/operations/balance-chart.component.js

@@ -53,6 +53,8 @@ var balanceChartModule = angular.module('balanceChartModule', [
                     ];
                 });
 
+                vm.chart.unload();
+
                 vm.chart.load({
                     rows: headers.concat(rows)
                 });

src/operations/category-chart.component.js

@@ -66,6 +66,8 @@ var categoryChartModule = angular.module('categoryChartModule', [
                     colors[expensesName] = expensesColor;
                 });
 
+                vm.chart.unload();
+
                 vm.chart.load({
                     columns: revenues.concat(expenses),
                     names: names,