make-client-package.sh: make minor improvements
make-client-package.sh: make minor improvements

Add error handling and improved output

yamcs/yamcs,m-sc/yamcs,fqqb/yamcs,fqqb/yamcs,fqqb/yamcs,fqqb/yamcs,fqqb/yamcs,yamcs/yamcs,yamcs/yamcs,yamcs/yamcs,m-sc/yamcs,m-sc/yamcs,yamcs/yamcs,yamcs/yamcs,m-sc/yamcs,fqqb/yamcs,m-sc/yamcs,m-sc/yamcs