Fix a bug in AliAnalysisAlien::CreateDataset
Fix a bug in AliAnalysisAlien::CreateDataset

This is a proposed hotfix for bug introduced after switching
to the TGrid API for creating the Grid collections in the
analysis plugin.

coppedis/AliRoot,miranov25/AliRoot,miranov25/AliRoot,coppedis/AliRoot,miranov25/AliRoot,miranov25/AliRoot,miranov25/AliRoot,alisw/AliRoot,miranov25/AliRoot,alisw/AliRoot,coppedis/AliRoot,alisw/AliRoot,coppedis/AliRoot,coppedis/AliRoot,alisw/AliRoot,coppedis/AliRoot,alisw/AliRoot,coppedis/AliRoot,miranov25/AliRoot,coppedis/AliRoot,miranov25/AliRoot,alisw/AliRoot,alisw/AliRoot,alisw/AliRoot