[Bug]: step context list should print an error to stderr and exit 1 if there are no contexts present

[jdoss]

Steps to Reproduce

I am looking for a way to tell if STEPPATH is using contexts or not.

$ export STEPPATH=/tmp/tmpsteppath
$ step ca bootstrap --ca-url https://my.cool.ca.smallstep.com --fingerprint myfingerprint 
$ step context list
$ echo $?
0

If STEPPATH is not using a context step context list should output that there are no contexts present to stderr and exit 1

Your Environment

Fedora Linux 37

$ step version
Smallstep CLI/0.23.4 (linux/amd64)

Expected Behavior

$ export STEPPATH=/tmp/tmpsteppath
$ step ca bootstrap --ca-url https://my.cool.ca.smallstep.com --fingerprint myfingerprint 
$ step context list
Error: There are no contexts to list
$ echo $?
1

Actual Behavior

$ export STEPPATH=/tmp/tmpsteppath
$ step ca bootstrap --ca-url https://my.cool.ca.smallstep.com --fingerprint myfingerprint 
$ step context list
$ echo $?
0

Additional Context

No response

Contributing

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[jdoss]

I guess one can use step context current to test if the STEPPATH is using a context but I think should we add the same behavior to step context list

$ step context current
no context selected
$ echo $?
1