When downloading a product partition report with includeZeroImpressions=false, we sometimes get rows with zero impressions. For example, we download a product partition report for a month, segmented by day and get some rows with zero impressions (although includeZeroImpressions is false). When setting includeZeroImpressions to true, we get rows for all product groups and days as expected. We are now filtering for zeroImpressions with a predicate (impressions > 0) and get no rows with zero impressions, so we have a solution for this. However, we are unsure about the usage and effect of the includeZeroImpression flag. Is this behavior intended?