Follow-up Comment #6, patch #1045 (project wesnoth):
Yes, even though I wouldn't mind having an unique test for whether a variable
exists or not, I agree with sapient's points about the scalar and array
problem and that any addition like this should not break the current
behaviour.
I think it's good enough if an unset variable simply equals to an empty
string (equals=""). We could of course explain that it works like this more
explicitly in the WML reference.
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