BusinessTemplate: don't export _erp5_coverage_filename

5 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

01:08:24

passed ERP5.PerformanceTest-Master

00:26:08

failed ERP5.UnitTest-Master

01:37:59

passed SlapOS.Eggs.UnitTest-Master.Python2

00:16:14

passed SlapOS.Eggs.UnitTest-Master.Python3

00:14:19