Unexpected stack order message

name: Unexpected stack order message
about: An error message is generated

Describe the bug
The following message is generated
"ERROR [kea-dhcp4.options/721920.139927012644608] EVAL_RESULT Expression "bootfile" evaluated to Incorrect stack order. Expected exactly 1 value at the end of evaluation, got 0"

To Reproduce
See configuration on RT ticket

Expected behavior
This message is unexpected

Environment:

Kea version: 2.0.1
OS: linux
Configuration backend
See RT ticket

Additional Information Maybe related to #2077 (closed)

RT #20066

Edited Mar 01, 2022 by Peter Davies

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