avoid warning triggered when id_ param is empty
avoid warning triggered when id_ param is empty

SQLAlchemy rises a warning when we do a IN with an empty list of ID.
This little fixes avoid the problem.

Change-Id: I604ec80037a3006046f64dcd214b9d0ec10866a6

redhat-cip/dci-control-server,redhat-cip/dci-control-server,enovance/dci-control-server,enovance/dci-control-server