Gui: use empty
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@@ -77,7 +77,7 @@ void Gui::ExpressionBinding::setExpression(std::shared_ptr<Expression> expr)
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if (expr) {
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const std::string error = docObj->ExpressionEngine.validateExpression(path, expr);
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if (error.size())
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if (!error.empty())
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throw Base::RuntimeError(error.c_str());
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}
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