Under certain circumstances, the common syndication parser generates log warnings when it encounters a feed item with an empty title in a feed.
1. Create a new feed with the URL:
2. Check /admin/reports/dblog.
3. You should see some php warnings "..Undefined offset...".
This seems to be a slow-moving feed, so that recipe should work for several months, until the items with empty titles drop off the end of the feed.
The problem is with the _parser_common_syndication_title function and just requires a very simple one-line fix.
A patch is attached. It's my first time making a patch file, so let me know if I've got the directories or anything else wrong!