fixup! examples/annotations: update functionality of channelName and namespace

Author: GregHolmes

examples/pub-sub-message-annotations/javascript/src/components/summary.ts

@@ -242,15 +242,17 @@ export function updateAnnotationSummary(message: MessageSummary) {
   }
 
   sectionsContainer.innerHTML = '';
-  const hasAnnotations = annotationTypes.some((type) => message.annotations.summary && message.annotations.summary[`${annotationNamespace}:${type.key}`]);
+  const hasAnnotations = annotationTypes.some(
+    (type) => message.annotations?.summary && message.annotations?.summary[`${annotationNamespace}:${type.key}`],
+  );
 
   if (!hasAnnotations) {
     sectionsContainer.appendChild(createEmptyAnnotationSummaryContentElement());
     return;
   }
 
   for (const { key } of annotationTypes) {
-    const entry = message.annotations.summary[`${annotationNamespace}:${key}`];
+    const entry = message.annotations?.summary[`${annotationNamespace}:${key}`];
     if (!entry) {
       continue;
     }