code: public Collection<Request> getRequests(RequestFilter filter) {
          filter = (filter != null) ? filter : new RequestFilter();
  
          filter.issues.clear();
          filter.issues.add(this);
          return getInstance().get().requests(filter);
      }
docs: Requests associated with this Issue.
  
  @param filter Criteria to filter stories and defects on. Pass a
  RequestFilter to get only Request, respectively.
  @return A collection requests that belong to this issue filtered by the
  passed in filter.