It would be clearer if the reports which have the record count '0', are not shown in the folder of the ADM server. This would make it easier to send out preload validation and error reports.
Consider if you are in a validated environment and you believe that 6 months, a year or two years down the road an outside auditor or inspector is going to want to review the results of your migration process, the zero-record reports can be used as one piece of evidence that the migration successfully checked for certain types of data errors and came up with no invalid records during migration time. Since SAP has inconsistent data auditing there are some tables or fields of data that may not keep a history of their values. So, for example, tracking down an invalid shelf-life value for some product in SAP we'll have pre and post load reports from the migration and validations for Shelf-Life showing no invalid records, etc. etc. which will indicate the shelf-life value was changed after migration. Without those reports, we cannot say for certain if that value was incorrect during the migration. And for an auditor, one invalid value coming from migration will call into question the entire migration.
We don't plan to change this functionality due to the reasons explained above.