hide empty ticker

ui/src/App.vue

@@ -4,7 +4,7 @@
       <TitleBar :title="title_html" />
       <HelloWorld />
     </v-main>
-    <TickerBar :content="ticker_html" />
+    <TickerBar v-if="ticker_html !== ''" :content="ticker_html" />
   </v-app>
 </template>
 

ui/src/components/TickerBar.vue

@@ -18,7 +18,7 @@ export default class TickerBar extends Vue {
   @Prop({ required: true })
   private readonly content!: string;
 
-  get marqueeDuration(): string {
+  private get marqueeDuration(): string {
     // 10 seconds + another second per 7 chars
     let dv = this.content ? Math.round(this.content.length / 7) : 0;
     return 10 + dv + "s";