code: @CheckForNull
      public <T> Model<T> getOrNull(Class<T> type, @CheckForNull Class<?> propertyOwner, @Nullable String property) {
          Model<T> m = models.get(type);
          if(m==null && type.getAnnotation(ExportedBean.class) != null) {
              m = new Model<T>(this, type, propertyOwner, property);
          }
          return m;
      }
docs: Instead of throwing {@link NotExportableException} this method will return null
  This should be used on hot paths where throwing the exception and catching it would incur a performance hit
  @return model
  @since 1.253