improved monitoring overview fetch interval start

Author: anhefti

client/src/pages/(app)/monitoring/[examId]/components/MonitoringOverviewClients.vue

@@ -16,7 +16,7 @@
                     class="position-relative flex-shrink-0"
                 >
                     <Doughnut
-                        v-if="chartData != null"
+                        v-if="chartData"
                         :data="chartData"
                         :options="chartOptions"
                     />

client/src/pages/(app)/monitoring/[examId]/index.vue

@@ -206,6 +206,7 @@ async function getIndicatorData() {
 }
 
 async function startIntervalRefresh() {
+    getOverviewData();
     intervalRefresh = setInterval(async () => {
         getOverviewData();
     }, REFRESH_INTERVAL);