Putting reference in `trigger` column leads to calculation being silently ignored

[lognaturel]

Issue introduced by #776, confirmed not to exist in v4.0.0

Test form: trigger.xlsx

• In v4.0.0 a setvalue action is produced
• After 733: Accept a list of references in the trigger column #776, no setvalue action is produced and the calculation is not passed through anywhere

I can't immediately explain how this is possible with all the tests passing!

The new behavior is similar to what would previously happen if something invalid were put in the trigger column. Ideally something invalid in the trigger column would throw an error.