Order of else and elsif blocks

[jg-rp]

Hi,

Related to #670 and #671, Shopify/Liquid will silently ignore any {% elsif %} tags after the first {% else %}.

Example template

{% if false %}a{% else %}b{% elsif true %}c{% endif %}

Shopify/Liquid output

b

LiquidJS output

c

[harttle]

fixed demo: https://liquidjs.com/playground.html#eyUgaWYgZmFsc2UgJX1heyUgZWxzZSAlfWJ7JSBlbHNpZiB0cnVlICV9Y3slIGVuZGlmICV9,e30=