fix: guard against None/empty input in clean_dangerous_html - #663
Merged
Syed-Ali-Abbas-568 merged 1 commit intoJul 31, 2026
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Problem
Course about page (/about) throws a 500 error when the course overview
is None or whitespace-only.
clean_dangerous_htmlpasses the valuedirectly to lxml, which returns None for empty input, causing:
AttributeError: 'NoneType' object has no attribute 'getroottree'
Fix
Updated the null check in
clean_dangerous_html(markup.py) to alsocatch whitespace-only strings, and return
HTML('')instead of theraw None to stay consistent with the function's return type.
Changes
openedx/core/djangolib/markup.py— addedhtml.strip()check and fixed return valueNote: this issue was previously fixed in #615 but the fix was not ported over to develop when upgrading.