checks OK URL: https://codereview.tryton.org/431301003
New changeset c68efc32f275 by Cédric Krier in branch 'default': Support not sized iterable in grouped_slice https://hg.tryton.org/trytond/rev/c68efc32f275
New changeset e010bed5a517 by Cédric Krier in branch 'default': Support not sized iterable in grouped_slice https://hg.tryton.org/tryton-env/rev/e010bed5a517