message: Fix math routing
  Conditionally trim the leading slash when routing to the math component only if it exists.
diff: @@ -602,10 +602,14 @@ export class MathCollection implements IComponentLoadable, IComponentCollection,
  }
  public async request(request: IRequest): Promise<IResponse> {
  - const instanceId = request.url
  - .substr(1)
  - .substr(0, !request.url.includes("/", 1) ? request.url.length : request.url.indexOf("/"));
  + // Trim leading slash, if it exists
  + const trimmedUrl = request.url.startsWith("/") ? request.url.substr(1) : request.url;
  + // Next segment is math instance id, if it exists
  + const instanceId = trimmedUrl
  + .substr(0, !trimmedUrl.includes("/", 1) ? trimmedUrl.length : trimmedUrl.indexOf("/"));
  +
  + // If no instance is requested, then the collection itself is being requested
  if (!instanceId) {
  return {
  mimeType: "fluid/component",
  