Fixed an issue when Unions had an empty top resultset
Fixed an issue when Unions had an empty top resultset

pamval/cda,diogofscmariano/cda,afrjorge/cda,FSchmidt-HGV/cda,diogofscmariano/cda,carlosrusso/cda,mkambol/cda,afrjorge/cda,davidmsantos90/cda,webdetails/cda,pedrofvteixeira/cda,e-cuellar/cda,smaring/cda,davidmsantos90/cda,mkambol/cda,davidmsantos90/cda,smaring/cda,smaring/cda,webdetails/cda,pedrofvteixeira/cda,webdetails/cda,FSchmidt-HGV/cda,afrjorge/cda,e-cuellar/cda,pamval/cda,jvelasques/cda,carlosrusso/cda,webdetails/cda,pedrofvteixeira/cda,pamval/cda,FSchmidt-HGV/cda,pedrofvteixeira/cda,davidmsantos90/cda,mkambol/cda,e-cuellar/cda,jvelasques/cda,jvelasques/cda,pamval/cda,carlosrusso/cda,diogofscmariano/cda