I did have rss configured before this, so maybe a user without it configured has options to enable atom or rss. I also don't see a way to disable rss feed.
Following is a screenshot of a test that includes and espionage report and circ to my alliance. As you see the communication message game back with a null value. gyazo.com/8d2d507e199f7d6e3a95cca50efc9c42
I have also seen this with combat reports but may also be an issue with other messages.
Chat messages are not longer in rss. Players used to be able to message non-alliance members and all messages would appear in rss. This is no longer the case.
For me CR's and alliance-messages also show up with "null" instead of "Combat Report or Alliance Message". Used Firefox as RSS-Reader with u680 as universe on version 6.0.5
This seems to be a bug with the way the integrated reader in Firefox is interpreting the feed. I have tested in another feed reader (Vienna) and the issue isn't present.
Or it could be that firefox rss reader is doing a strict interpretation of XML. The link below show that there is a <span> </span> tag in the items that have issues that probably shouldn't be there: gyazo.com/7049a1e46715d2cc9a02743ffbc8a37e
Yes it is problem with a FireFox integrated reader. Also i checked RSS xml file without reader and there is title. So firefox is not recognizing it for some reason. Code <span> should be there, it it not a mistake.
Because everything is ok at our end i will put Clarified prefix.