startup more defensive for the case where the docker exec commands return nothing.  Fixes this error: getting ./startup.sh: line 86: [: ==: unary operator expected
startup more defensive for the case where the docker exec commands return nothing.  Fixes this error: getting ./startup.sh: line 86: [: ==: unary operator expected

AccenturePDC/adop-docker-compose,nickdgriffin/adop-docker-compose,dsingh07/adop-docker-compose,SachinKSingh28/adop-docker-compose,kramos/adop-docker-compose,nickdgriffin/adop-docker-compose,SachinKSingh28/adop-docker-compose,dsingh07/adop-docker-compose,kramos/adop-docker-compose,AccenturePDC/adop-docker-compose,prunella2017/adop-docker-compose,katrinazvaigzne/adop-docker-compose,prunella2017/adop-docker-compose,nickdgriffin/adop-docker-compose,SachinKSingh28/adop-docker-compose,kramos/adop-docker-compose,prunella2017/adop-docker-compose,AccenturePDC/adop-docker-compose,dsingh07/adop-docker-compose