fix: report error for malformed else/elsif/endif/endfor, #713

docs/source/tutorials/differences.md

@@ -34,7 +34,7 @@ Though we're trying to be compatible with the Ruby version, there are still some
     * LiquidJS-defined filters: [json][json], group_by, group_by_exp, where_exp, jsonify, inspect, etc.
     * Tags/filters that don't depend on Shopify platform are borrowed from [Shopify][shopify-tags].
     * Tags/filters that don't depend on Jekyll framework are borrowed from [Jekyll][jekyll-filters].
-* Some tags/filters behave differently: [date][date] filter.
+* Some tags/filters behave differently: [date][date] filter, malformed tags (like duplicated `else`, extra args for `endif`) throw errors in LiquidJS. 
 
 [date]: https://liquidjs.com/filters/date.html
 [layout]: ../tags/layout.html

docs/source/zh-cn/tutorials/differences.md

@@ -34,7 +34,7 @@ LiquidJS 一直很重视兼容于 Ruby 版本的 Liquid。Liquid 模板语言最
     * LiquidJS 自己定义的过滤器：[json][json]。
     * 从 [Shopify][shopify-tags] 借来的不依赖 Shopify 平台的标签/过滤器。
     * 从 [Jekyll][jekyll-filters] 借来的不依赖 Jekyll 框架的标签/过滤器。
-* 有些过滤器和标签表现不同：比如 [date][date]。
+* 有些过滤器和标签表现不同：比如 [date][date]，非法的标签（比如重复的 `else`，`endif` 的多余参数）在 LiquidJS 中会抛出异常。
 
 [layout]: ../tags/layout.html
 [render]: ../tags/render.html