fixed config checker for falsy values
fixed config checker for falsy values

Change-Id: I1c42fe23126ecd17be788bd791ccc12152e0ce22

bq/corbel-composer,rafinskipg/corbel-composr,jscMR/corbel-composr,corbel-platform/corbel-composr,milingo/corbel-composr,jarpi/corbel-composr