profile list returns non-zero if a cluster is not running

when I was looking at this intergeration test that failed because profile list says one of the clusters is not running yet...

https://storage.googleapis.com/minikube-builds/logs/6717/e653589/Docker_Linux.html#fail_TestFunctional%2fparallel%2fProfileCmd%2fprofile_list

and also one of the users who was using minikube in a test script,... made me think.

When are the resonable times to exit none-zero for profile list ?

currently we exit non-zero for the following:

• If there is no profile .
• if there are a few profiles are one of them has error to give status running.