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Interesting question, Balazs!
Without using interpolated data, the chart will map the actual values. One way around it would be to constrain your found set to contain only dates that have values. This however, will leave you with an X axis that contains non-consecutive dates(may 1, may 2, may 3, may 6, may 7...), but will achieve a chart without any 'zero' values. Unfortunately, there is no way to 'skip' null values that I can think of.