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throw meaningful message if helper function is not defined #105

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Make error message more explicit if the helper function does not exist.


Thanks Pat. See your combined request too.

Currently the design is to allow for jagged data (undefined properties) by rendering {{:undefinedProperty}} as the empty string. I think the same should happen for {{:~undefinedHelper}} (Here undefinedHelper is not necessarily a function, so really this is another way of passing in either data values or methods, just as data.undefined may be a missing method or property from the data model.)

Similarly if foo is a converter {{foo:name}}, or a tag {{foo/}}, we don't throw if they are undefined, but treat them as no-ops, returning the empty string, (or the unchanged value, for a converter).

@BorisMoore BorisMoore closed this Apr 24, 2012
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