Add test for Map type has no numpy dtype
Add test for Map type has no numpy dtype

quantopian/datashape,blaze/datashape,cowlicks/datashape,quantopian/datashape,cowlicks/datashape,blaze/datashape,ContinuumIO/datashape,cpcloud/datashape,cpcloud/datashape,ContinuumIO/datashape