From a59edbc0a485b7020b8a7b63288a7ddc05bfefdd Mon Sep 17 00:00:00 2001
From: Tim Grelka <grelka@indibit.eu>
Date: Fri, 29 Aug 2025 00:30:26 +0200
Subject: [PATCH] fix: ignore None tokens in render_inner

---
 renderer/fifty_ohm_html_renderer.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/renderer/fifty_ohm_html_renderer.py b/renderer/fifty_ohm_html_renderer.py
index b53d4e8..9e00d84 100644
--- a/renderer/fifty_ohm_html_renderer.py
+++ b/renderer/fifty_ohm_html_renderer.py
@@ -182,10 +182,13 @@ class FiftyOhmHtmlRenderer(HtmlRenderer):
 
     def render_document(self, token: Document) -> str:
         self.footnotes.update(token.footnotes)
-        # Filter out None values, so block tokens can return None to not be rendered.
-        inner = "\n".join(filter(lambda x: x is not None, [self.render(child) for child in token.children]))
+        inner = self.render_inner(token, "\n")
         return f"{inner}\n" if inner else ""
 
+    def render_inner(self, token, base="") -> str:
+        # Filter out None values, so block tokens can return None to not be rendered.
+        return base.join(filter(lambda x: x is not None, [self.render(child) for child in token.children]))
+
     @staticmethod
     def render_picture_helper(id, ref, text, number):
         return f"""