I have already answered your question in the ticket, but I will post the same response here in case someone else from the community has the same query:
A possible solution would be to set the missingValues setting to `gap`.
template: 'Actual Qty' + ': #= value #m³'
data: ['0', '3', '4', '4', '4', '12', '13', '14', '15', null, null, null, null],
template: 'Forecasted Qty' + ': #= value #m³'
data: [null, null, null, null, null, null, null, null, '15', '15', '18', '20', '24'],
For your convenience I have modified the provided sample:
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