Show Filter Null only if there is null in the vis – fixes #204
Show Filter Null only if there is null in the vis – fixes #204

vivekratnavel/polestar,pallavkul/polestar,zegang/polestar,zegang/polestar,vega/polestar,smartpcr/polestar,pallavkul/polestar,uwdata/polestar,pallavkul/polestar,vega/polestar,sandbox/polestar,sandbox/polestar,uwdata/polestar,smartpcr/polestar,hortonworks/polestar,hortonworks/polestar,jsanch/polestar,jsanch/polestar,hortonworks/polestar,vivekratnavel/polestar,jsanch/polestar,dennari/hack-n-hackers-polestar,uwdata/polestar,vega/polestar,smartpcr/polestar,vivekratnavel/polestar,sandbox/polestar,zegang/polestar,dennari/hack-n-hackers-polestar,dennari/hack-n-hackers-polestar