Fix sliceExpressions. Doesn't works if the first node has no child (e.g: ref)
Fix sliceExpressions. Doesn't works if the first node has no child (e.g: ref)

JonathanSalwan/Triton,JonathanSalwan/Triton,JonathanSalwan/Triton,JonathanSalwan/Triton,JonathanSalwan/Triton