Add back MR-81
Fixes the code from https://gitlab.pagedmedia.org/tools/pagedjs/merge_requests/81 that got removed with the rever of https://gitlab.pagedmedia.org/tools/pagedjs/merge_requests/76
Fixes the code from https://gitlab.pagedmedia.org/tools/pagedjs/merge_requests/81 that got removed with the rever of https://gitlab.pagedmedia.org/tools/pagedjs/merge_requests/76