don't pollute minikube profile list with errors if exitcode is absent

[prezha]

before

minikube profile list

E0928 22:06:31.537339 1021169 status.go:304] exit code not found: strconv.Atoi: parsing "": invalid syntax
E0928 22:06:31.537365 1021169 status.go:304] exit code not found: strconv.Atoi: parsing "": invalid syntax
E0928 22:06:31.537379 1021169 status.go:304] exit code not found: strconv.Atoi: parsing "": invalid syntax
|---------|-----------|------------|----------------|------|---------|--------|-------|----------------|--------------------|
| Profile | VM Driver |  Runtime   |       IP       | Port | Version | Status | Nodes | Active Profile | Active Kubecontext |
|---------|-----------|------------|----------------|------|---------|--------|-------|----------------|--------------------|
| falco   | kvm2      | containerd | 192.168.39.134 | 8443 | v1.31.0 | OK     |     1 |                |                    |
|---------|-----------|------------|----------------|------|---------|--------|-------|----------------|--------------------|

after

minikube profile list

|---------|-----------|------------|----------------|------|---------|--------|-------|----------------|--------------------|
| Profile | VM Driver |  Runtime   |       IP       | Port | Version | Status | Nodes | Active Profile | Active Kubecontext |
|---------|-----------|------------|----------------|------|---------|--------|-------|----------------|--------------------|
| falco   | kvm2      | containerd | 192.168.39.134 | 8443 | v1.31.0 | OK     |     1 |                |                    |
|---------|-----------|------------|----------------|------|---------|--------|-------|----------------|--------------------|

[spowelljr]

Thanks for the fix!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: prezha, spowelljr

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [prezha,spowelljr]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment