Pygments needs a non-None value for code block title

docs/src/markdown/about/changelog.md

@@ -3,6 +3,10 @@ icon: lucide/scroll-text
 ---
 # Changelog
 
+## 10.21.1
+
+-   **FIX**: Highlight: Latest Pygments versions cannot handle a "filename" for code block titles of `None`.
+
 ## 10.21
 
 -   **NEW**: Caption: Add support for specifying not only IDs but classes and arbitrary attributes. Initial work by

pymdownx/__meta__.py

@@ -193,5 +193,5 @@ def parse_version(ver: str) -> Version:
     return Version(major, minor, micro, release, pre, post, dev)
 
 
-__version_info__ = Version(10, 21, 0, "final")
+__version_info__ = Version(10, 21, 1, "final")
 __version__ = __version_info__._get_canonical()

pymdownx/highlight.py

@@ -394,6 +394,8 @@ def highlight(
                 title = self.auto_title_map.get(name, name)
             if title:
                 title = title.strip()
+            if title is None:
+                title = ''
 
             # Setup formatter
             html_formatter = InlineHtmlFormatter if inline else BlockHtmlFormatter