code: @SuppressWarnings("null")
    protected final @NotNull String getMediaRefProperty(@NotNull MediaRequest mediaRequest,
        @Nullable MediaHandlerConfig mediaHandlerConfig) {
      String refProperty = mediaRequest.getRefProperty();
      if (StringUtils.isEmpty(refProperty)) {
        if (mediaHandlerConfig != null) {
          refProperty = mediaHandlerConfig.getMediaRefProperty();
        }
        else {
          refProperty = MediaNameConstants.PN_MEDIA_REF;
        }
      }
      return refProperty;
    }
docs: Get property name containing the media request path
  @param mediaRequest Media request
  @param mediaHandlerConfig Media handler config (can be null, but should not be null)
  @return Property name