added warning for missing nodes in network conifg

src/app/app.module.ts

@@ -52,6 +52,7 @@ import {NgbModule} from '@ng-bootstrap/ng-bootstrap';
 import { SummaryNodeComponent } from './pages/explorer-page/summary-node/summary-node/summary-node.component';
 import { NetworkOverviewComponent } from './pages/explorer-page/network-overview/network-overview/network-overview.component';
 import { InfoTileEdgeComponent } from './components/info-tile-edge/info-tile-edge/info-tile-edge.component';
+import { NetworkEmptyWarningComponent } from './components/network-empty-warning/network-empty-warning.component';
 
 
 @NgModule({
@@ -93,6 +94,7 @@ import { InfoTileEdgeComponent } from './components/info-tile-edge/info-tile-edg
     SummaryNodeComponent,
     NetworkOverviewComponent,
     InfoTileEdgeComponent,
+    NetworkEmptyWarningComponent,
   ],
   imports: [
     BrowserModule,

src/app/pages/explorer-page/explorer-page.component.html

@@ -4,6 +4,7 @@
     <app-fa-icons></app-fa-icons>
     <app-loading-screen></app-loading-screen>
     <app-network-warning></app-network-warning>
+    <app-network-empty-warning></app-network-empty-warning>
     <app-group-warning></app-group-warning>
     <app-parser-warning></app-parser-warning>
     <app-privacy-banner></app-privacy-banner>

src/app/pages/explorer-page/explorer-page.component.ts

@@ -77,7 +77,13 @@ export class ExplorerPageComponent implements OnInit, AfterViewInit {
       return;
     }
     try {
-      this.networkJSON = JSON.stringify(typeof network === 'string' ? JSON5.parse(network) : network);
+      const nw = typeof network === 'string' ? JSON5.parse(network) : network;
+      if (!nw.nodes || nw.nodes.length === 0) {
+        this.drugstoneConfig.gettingNetworkEmpty = true;
+        console.log('No nodes specified in network config.');
+        return;
+      }
+      this.networkJSON = JSON.stringify(nw);
     } catch (e) {
       this.drugstoneConfig.parsingIssueNetwork = true;
       console.error('Failed parsing input network');

src/app/services/drugstone-config/drugstone-config.service.ts

@@ -12,6 +12,7 @@ export class DrugstoneConfigService {
   public parsingIssueNetwork = false;
   public parsingIssueGroups = false;
   public gettingNetworkIssue = true;
+  public gettingNetworkEmpty = false;
   public groupIssue = false;
   public groupIssueList = [];
   public smallStyle = false;

src/stylesheets/variables.scss

@@ -64,7 +64,8 @@ $text-normal-font-size: 12px;
 $text-small-font-size: 11px;
 
 $privacy-banner-z: 40;
-$parser-issue-banner-z: 41;
+$network-empty-banner-z: 41;
+$parser-issue-banner-z: 42;
 
 $fullscreen-z: 2147483646;
 $toast-z: 2147483647;