Add a dummy line in DM export file

Summary:

We would like to add a dummy line in a data management export file to keep the structure the same.

Content (required):

Hi,

We have a DM export rule which creates a file which is sent to a target application. This file has the account dimension in the columns (pivot option in DM), structure is as below:

This export is done for multiple entities, for some of the entities not all accounts have data. At the moment, when we create an export file for an entity which doesn't have data on all the accounts, the account is not included in the file, like below: