[dataimport] stop supporting None as eids_seq_range
It couldn't work as-is because entities_id_seq is not a sequence object.
/*
* cubicweb js mock for unit tests
* This module defines variables and functions used in quite a few places
* in cw js framework that can't be used or guessed without a real CW server
*/
var pageid = 'my-page-id';
function _(message) {
return message;
}