Follow-up Comment #9, patch #1045 (project wesnoth):
It sounds like the person who worked on the Tutorial had a bug in their code
and was simply confused.
This method of testing for empty string works fine:
[variable]
name=foo
equals=$empty
[/variable]
This method had problems in the past (not sure if it was fixed yet or not):
[variable]
name=foo
equals=""
[/variable]
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