Fix up cat_dshape function a bit
Fix up cat_dshape function a bit

markflorisson/datashape,blaze/datashape,llllllllll/datashape,blaze/datashape,cpcloud/datashape,FrancescAlted/datashape,cpcloud/datashape,ContinuumIO/datashape,llllllllll/datashape,quantopian/datashape,ContinuumIO/datashape,cowlicks/datashape,FrancescAlted/datashape,cowlicks/datashape,aterrel/datashape,markflorisson/datashape,quantopian/datashape,aterrel/datashape