Fix error on inserting node without raws in some cases

Author: ai

lib/container.js

@@ -214,6 +214,8 @@ class Container extends Node {
       i = i.proxyOf
       if (i.parent) i.parent.removeChild(i)
       if (i[isClean]) markTreeDirty(i)
+
+      // if (!i.raws) i.raws = {}
       if (typeof i.raws.before === 'undefined') {
         if (sample && typeof sample.raws.before !== 'undefined') {
           i.raws.before = sample.raws.before.replace(/\S/g, '')