Update channels map indexing indicator

frontend/src/app/lightning/node-statistics-chart/node-statistics-chart.component.ts

@@ -81,7 +81,7 @@ export class NodeStatisticsChartComponent implements OnInit {
           color: 'grey',
           fontSize: 15
         },
-        text: `Loading`,
+        text: $localize`No data to display yet. Try again later.`,
         left: 'center',
         top: 'center'
       };

frontend/src/app/lightning/nodes-channels-map/nodes-channels-map.component.ts

@@ -206,20 +206,13 @@ export class NodesChannelsMap implements OnInit {
   prepareChartOptions(nodes, channels) {
     let title: object;
     if (channels.length === 0 && !this.placeholder) {
-      this.chartOptions = null;
-      this.showIndexingInProgress = true;
       this.isLoading = false;
-      return;
-    }
-
-    // empty map fallback
-    if (channels.length === 0 && this.placeholder) {
       title = {
         textStyle: {
           color: 'white',
           fontSize: 18
         },
-        text: $localize`No geolocation data available`,
+        text: $localize`No data to display yet. Try again later.`,
         left: 'center',
         top: 'center'
       };