#18 Error in piechart with action=percent

[Anonymous]

when i try to make a report with a piechart like this
PieChart(top=2.5*cm, left=1*cm, height=3*cm, width=5*cm,
cols_attribute='denomination', rows_attribute='equipment_tag',
cell_attribute='equipment_id', action='percent', legend_labels=True,
slice_popout=1)
and the data that i want to calculate percent have integers values the result of percent is 0
and chart only show the legend.

[Anonymous]

patch to fix calc of integer values data