dashboard: detect nonexistent profile instead of causing a panic

[fenglixa]

Fix for #4359

My UT result could see the picture:

[k8s-ci-robot]

Hi @fenglixa. Thanks for your PR.

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[minikube-bot]

Can one of the admins verify this patch?

[tstromberg]

Thank you for doing this! This is a much better user experience.

[medyagh]

@minikube-bot OK to test

[medyagh]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: fenglixa, medyagh
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[sharifelgamal]

@minikube-bot OK to test