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Fix #27 Make getSubstitutionValue() more consistent

Changed Variable's getSubstitutionValue() to return the empty string
in the case where a modifier character has been defined but it is
immediately followed by a bracket such as ${variable:+}. In cases
where no modifier character has been defined such as $variable,
${variable}, or ${variable:}, null will be returned instead. This
should hopefully make the function a little more predictable and
easier to use.

Signed-off-by: Remy Suen <remy.suen@gmail.com>

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