Pie Chart - missing labels

[paulmalherbe]

Hi
The following code produces the attached pie chart test.png.
Their are 4 missing labels, Apr, May, Jun and Jul.
Is this a bug or am I missing something?

import pygal

cols = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
vals = [119, 317, 95, 46, 67, 75, 52, 318, 238, 88, 117, 109]
chart = pygal.Pie(print_labels=True, show_legend=False)
chart.title = 'WESTERN PROVINCE CRICKET CLUB\n Active for Period 2014-01 to 2014-12 (Count)'
for num, dat in enumerate(cols):
chart.add(dat, [{'value': vals[num], 'label': dat}])
chart.render()

Thanks
test.pdf