message: MINOR: Fixing run time undefined access
diff: @@ -95,7 +95,11 @@ function exampleBrowser(exampleDefinitions: ExampleDefinitions) {
  title.innerHTML = menuElement;
  titleElements.push(title);
  menu.appendChild(title);
  - categories[menuElement].forEach(anchor => {
  + const category = categories[menuElement];
  + if (category === undefined) {
  + return;
  + }
  + category.forEach(anchor => {
  menu.appendChild(anchor);
  });
  exampleListElement.appendChild(menu);
  