How are you setting
<local-value>
?
I suspect it never returns an empty list, and therefore the else clause is
never triggered.
For example, the following will never trigger an else clause when used in a
filter, as it will never return an empty list:
<$set name=config-tiddler value={{{ [[$config-name$]addprefix[$:/config/]]
}}}>
Assuming that each filter run returns an empty list when it should not be
used, you can also use the form:
{{{ [<local-value>] [<global-config-value>] [<config-default>] +[first[]]
}}}
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