make tic labels optional for bar charts

pdb-js/src/app/visualization-page/visualization-page.component.ts

@@ -53,6 +53,7 @@ export class VisualizationPageComponent implements OnInit {
   
   intervalUnit = 'NO_INTERVAL';
   intervalValue = 1;
+  renderBarChartTickLabels = false;
 
   constructor(private plotService: PlotService, private snackBar: MatSnackBar) {
   }
@@ -172,6 +173,7 @@ export class VisualizationPageComponent implements OnInit {
     request.generateThumbnail = this.enableGallery;
     request.intervalUnit = this.intervalUnit;
     request.intervalValue = this.intervalValue;
+    request.renderBarChartTickLabels = this.renderBarChartTickLabels;
     return request;
   }