How to display data with value '0' in chart with chart.js? - django

Question

I have a chart of 3 data-Chinese Book, English Book, Malay Book.
Chinese book has 300, English Book has 400, Malay Book has 0.
It works fine when I only display Chinese Book and English Book.
When I add in Malay Book for display, it doesn't return errors but displays nothing.
Here is my function for bar chart,
function setChart(){
var ctx = document.getElementById("avgPageCount");
var avgPageCount = new Chart(ctx, {
type: 'bar',
data: {
labels: {{ chartdata_labels|safe }},
datasets: [{
label: '# of votes',
data: {{ chartdata_data }},
backgroundColor: {{ chart_bg | safe }} ,
borderColor: {{ chart_bd | safe }},
borderWidth: 1
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero:true
}
}]
}
}
});
}
window.onload = setChart;
Malay book will return 0 since there is no new register book for this month.
malay_book= Book.objects.filter(reg_date__range(current_month_first_day,today)).aggregate(Sum('total'))['total_sum']
_out_label.append('Malay Book')
_out_data.append(malay_book)
Is the chart won't display value with '0'?