AUDIENCE_PERFORMANCE_REPORT zero impression issue v201603

Hi,

I would like to fetch audiance lists (RLSA) from adgroups including zero impressions,
but unfortunately "AUDIENCE_PERFORMANCE_REPORT" is giving results only impressions >= 1,
i.e report is fetching only those audiance (RLSA) have impressions, but i want result with including zero impressions lists.
please check my reporting query below.

report_downloader = adwords_client.GetReportDownloader(version = 'v201603')
report = {
              'reportName': 'CUSTOM_DATE AUDIENCE_PERFORMANCE_REPORT',
              'dateRangeType': 'ALL_TIME',
              'reportType': 'AUDIENCE_PERFORMANCE_REPORT',
              'downloadFormat': 'XML',
              'selector': {
                           'fields': ['CampaignId', 'AdGroupId', 'AdGroupName' , 'Clicks', 'Cost', 'Conversions', 'ConversionValue', 'BidModifier', 'CampaignName', 'Id','Criteria','Impressions' ],
                           'predicates': [                                         
                                            {
                                               'field': 'Status',
                                               'operator': 'IN',
                                               'values': ['ENABLED']
                                            }
                                          ],
                          },
              }
with open(report_path, 'w') as output_file:
        file_path = report_downloader.DownloadReport(report, output_file)


please let me know how can i resole this issue, early help is appreciated, Thank you!         

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