Sending empty report


i have a question about reports.

i have a sheet with tracking of my manufecturing per customer and i generate a report for status per customer.

and every week on Sunday ths system send via email the reports in EXCEL format.

my question is:

in week that the report is empty customer has no products in production process, is there way to stop the sending by email ?

i want to send the XLS report only when there is items in fabrication progress