Hi Dmitriy,
  I apologize for the delay.  My colleague pointed out that your Selector 
includes the IsNegative field.  This field was incorrectly exposed in the 
Ad Performance Report.  It is a keyword field useful in Keyword Performance 
reports when obtaining keyword structure.  Because of the way this is tied 
to the Ad Performance Report, it has the side-effect of excluding zero 
impression rows when included as a field in this report.  I've updated the 
documentation for this field to reflect this: 
http://code.google.com/apis/adwords/docs/appendix/reports.html#ad

If you remove this field, you should get back zero impression rows.

- Kevin Winter
AdWords API Team

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