Fix: Prevent error from all whitespace lang string (#2036)

jupyter · Aug 27, 2023 · fad2fdf · fad2fdf
1 parent 1011701
commit fad2fdf
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/nbconvert/filters/markdown_mistune.py b/nbconvert/filters/markdown_mistune.py
@@ -299,8 +299,9 @@ def block_code(self, code: str, info: Optional[str] = None) -> str:
                 return self.block_mermaidjs(code)
 
             try:
-                lang = info.strip().split(maxsplit=1)[0]
-                lexer = get_lexer_by_name(lang, stripall=True)
+                if info.strip().split(None, 1):
+                    lang = info.strip().split(maxsplit=1)[0]
+                    lexer = get_lexer_by_name(lang, stripall=True)
             except ClassNotFound:
                 code = f"{lang}\n{code}"
                 lang = None