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Checking status on default failing

After upgrdaing VirtualBox I was unable to start Docker Toolbox. start.sh script failed on step “Checking for status…” After unistalling both virtualbox and docker toolbox a number of times I have eventually found a way around the problem by alterintg start.sh. I have changed line

VM_STATUS="( set +e ; "{DOCKER_MACHINE}" status “${VM}” )"

removing the set +e to

VM_STATUS="( "{DOCKER_MACHINE}" status “${VM}” )"

Everthing still appears to work but can anyone explain what impact if any removing set +e will have please?