[stringtemplate-interest] patch

[Roman Odaisky]

> Maybe it’s an “if something:” in a place where “if something is not None:”
> should have been used.

Attached patch fixes it.

In getObjectProperty I have replaced “not propertyName” with an explicit 
comparison against "" and None. In ActionEvaluator.attribute I only check for 
None, because str(None) is equal to an undesirable "None", and "" will be 
handled by subsequent getObjectProperty invocation.

-- 
HTH
Roman.
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