[Rust] Handle correctly Epsilon in default semantic action
[Rust] Handle correctly Epsilon in default semantic action

DmitrySoshnikov/syntax,DmitrySoshnikov/syntax,DmitrySoshnikov/syntax,DmitrySoshnikov/syntax,DmitrySoshnikov/syntax,DmitrySoshnikov/syntax,DmitrySoshnikov/syntax,DmitrySoshnikov/syntax,DmitrySoshnikov/syntax