Added a blank data value when column from submission is blank
Added a blank data value when column from submission is blank

sounay/flaminggo-test,ehealthafrica-ci/onadata,jomolinare/kobocat,ultimateprogramer/formhub,SEL-Columbia/formhub,eHealthAfrica/onadata,awemulya/fieldsight-kobocat,eHealthAfrica/formhub,eHealthAfrica/formhub,qlands/onadata,mainakibui/kobocat,eHealthAfrica/formhub,ehealthafrica-ci/formhub,ehealthafrica-ci/formhub,eHealthAfrica/formhub,GeoODK/onadata,mainakibui/kobocat,makinacorpus/formhub,smn/onadata,ehealthafrica-ci/onadata,awemulya/fieldsight-kobocat,wesley1001/formhub,makinacorpus/formhub,piqoni/onadata,GeoODK/onadata,ehealthafrica-ci/onadata,ehealthafrica-ci/formhub,mainakibui/kobocat,hnjamba/onaclone,qlands/onadata,kobotoolbox/kobocat,ehealthafrica-ci/onadata,qlands/onadata,hnjamba/onaclone,spatialdev/onadata,qlands/onadata,makinacorpus/formhub,ultimateprogramer/formhub,GeoODK/formhub,smn/onadata,SEL-Columbia/formhub,piqoni/onadata,kobotoolbox/kobocat,jomolinare/kobocat,GeoODK/onadata,ehealthafrica-ci/formhub,smn/onadata,wesley1001/formhub,hnjamba/onaclone,kobotoolbox/kobocat,sounay/flaminggo-test,smn/onadata,awemulya/fieldsight-kobocat,ultimateprogramer/formhub,sounay/flaminggo-test,piqoni/onadata,wesley1001/formhub,ultimateprogramer/formhub,piqoni/onadata,spatialdev/onadata,eHealthAfrica/onadata,GeoODK/formhub,kobotoolbox/kobocat,mainakibui/kobocat,jomolinare/kobocat,GeoODK/onadata,awemulya/fieldsight-kobocat,eHealthAfrica/onadata,spatialdev/onadata,GeoODK/formhub,wesley1001/formhub,hnjamba/onaclone,sounay/flaminggo-test,spatialdev/onadata,SEL-Columbia/formhub,jomolinare/kobocat,makinacorpus/formhub,SEL-Columbia/formhub