fix: table control filter dropdowns now handle empty result sets (hypertrace#1236)

Author: jake-bassett

projects/observability/src/shared/dashboard/widgets/table/table-widget-renderer.component.ts

@@ -203,11 +203,13 @@ export class TableWidgetRendererComponent
   protected fetchAndPopulateSelectControls(): void {
     this.selectControls$ = this.getSelectControls().pipe(
       tap((selectControls: TableSelectControl[]) => {
-        selectControls.forEach(selectControl =>
-          this.publishSelectValuesChange(
-            selectControl.options[0].metaValue.field,
-            selectControl.options.filter(o => o.applied)
-          )
+        selectControls.forEach(
+          selectControl =>
+            selectControl.options.length > 0 &&
+            this.publishSelectValuesChange(
+              selectControl.options[0].metaValue.field,
+              selectControl.options.filter(o => o.applied)
+            )
         );
       })
     );