fix: exec_provider.py

[calebAtIspot]

see #2136

What type of PR is this?

/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #2136

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Yes, but only in the error message

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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