Don't show sunburst chart at start

Author: matthewma7

client/src/components/Sunburst.vue

@@ -130,6 +130,7 @@ export default {
         });
 
       this.debouncedUpdate = debounce(this.update.bind(this), 500);
+      this.update(this.sunburstData);
 
       this.chart(this.$el);
     });

client/src/views/Home.vue

@@ -216,7 +216,7 @@ export default {
                   <h4>Sunburst</h4>
                 </v-card-title>
                 <v-card-text class="white-card-text">
-                  <Sunburst :filteredTables="filteredTables" :cmap="cmap" />
+                  <Sunburst v-if="selectedSamples.length" :filteredTables="filteredTables" :cmap="cmap" />
                 </v-card-text>
               </v-card>
             </v-flex>