fixed aggregate value retrieval from object
fixed aggregate value retrieval from object

BrendanBerkley/django-report-builder,altanawealth/django-report-builder,BrendanBerkley/django-report-builder,AbhiAgarwal/django-report-builder,altanawealth/django-report-builder,BrendanBerkley/django-report-builder,AbhiAgarwal/django-report-builder,altanawealth/django-report-builder,AbhiAgarwal/django-report-builder