Potential issue

[un_pogaz]

Has I work for implement the last various new default rules of ruff, I found a issue that could lead to bugs, but the potential scope make that I not confident to commit this fix alone. See the patch.
To be short: a function don't return a value when it usage implie that it should be.

calibre.ebooks.oeb.polish.report
css_data.<local>.tag_text

From 6f427eda1aaca9f9371edee778060f8652794ae6 Mon Sep 17 00:00:00 2001
From: un-pogaz <46523284+un-pogaz@users.noreply.github.com>
Date: Wed, 21 Oct 2026 16:40:50 +0200
Subject: [PATCH] fix tag_text()

---
 src/calibre/ebooks/oeb/polish/report.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/calibre/ebooks/oeb/polish/report.py b/src/calibre/ebooks/oeb/polish/report.py
index a24c911bf9..e3006644ab 100644
--- a/src/calibre/ebooks/oeb/polish/report.py
+++ b/src/calibre/ebooks/oeb/polish/report.py
@@ -314,6 +314,7 @@ def tag_text(elem):
                 attribs = ' '.join('{}="{}"'.format(k, prepare_string_for_xml(elem.get(k, ''), True)) for k in elem.keys())
                 return f'<{tag} {attribs}>'
             ans = tt_cache[elem] = f'<{tag}>'
+        return ans
 
     def matches_for_selector(selector, select, class_map, rule):
         lsel = selector.lower()
--