This code section near the bottom of markdown.treeprocessors raises AttributeError if pre[0].text is None.
# Clean up extra empty lines at end of code blocks.
pres = root.iter('pre')
for pre in pres:
if len(pre) and pre[0].tag == 'code':
pre[0].text = util.AtomicString(pre[0].text.rstrip() + '\n')
The check should be if len(pre) and pre[0].tag == 'code' and pre[0].text is not None or isinstance(pre[0].text, str), but that may be too strict.
I encountered this with a custom Block/Inline processor. The band-aid fix was just to ensure these elements had text.
for pre in root.iter("pre"):
if pre[0].text is None:
pre[0].text = ""
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