Generate dummy test object after build

DataWarehouse detects if a revision is ready to report by checking that all the objects have results available. As the build results are submitted before the test plan (build vs setup), there is a time window before the test plan arrives where the checkout is ready_to_report.

Avoid adding a time check (ej build needs to be older than x minutes) on the ready_to_report check by submitting a dummy empty test object which will be overwritten by the real test plan.