Add post_blank to the rust types.

src/intermediate/plain_list.rs

@@ -1,12 +1,13 @@
 use super::macros::intermediate;
-
 use super::IPlainListItem;
 use crate::error::CustomError;
+use organic::types::StandardProperties;
 
 #[derive(Debug, Clone)]
 pub(crate) struct IPlainList {
     pub(crate) list_type: organic::types::PlainListType,
     pub(crate) children: Vec<IPlainListItem>,
+    pub(crate) post_blank: organic::types::PostBlank,
 }
 
 intermediate!(
@@ -26,6 +27,7 @@ intermediate!(
         Ok(IPlainList {
             list_type: original.list_type,
             children,
+            post_blank: original.get_post_blank(),
         })
     }
 );