market map adding null check
market map adding null check

SylvainCorlay/bqplot,SylvainCorlay/bqplot,bloomberg/bqplot,rmenegaux/bqplot,bloomberg/bqplot,bloomberg/bqplot,dmadeka/bqplot,dmadeka/bqplot,ChakriCherukuri/bqplot,SylvainCorlay/bqplot,ssunkara1/bqplot,ChakriCherukuri/bqplot,ChakriCherukuri/bqplot,ssunkara1/bqplot,rmenegaux/bqplot