If setting it to an empty string when you don't want it to run is okay
for your use case, you could do:
when: foo|default("") != ""
That will compare against the value of foo when it's defined, and
otherwise compare against an empty string.
--
Nick Groenen | zoni | @NickGroenen
https://zoni.nl | GnuPG/GPG key ID: 0xAB5382F6
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