Thank you, I was wrong 'bout hyphen, I removed it, but now I see More... everywhere, even if a particular entry doesn't have LOG, More... is shown. Is something wrong with my condition? By the way, I tried log.content and got the same result.
I tried that, but now I don't see More even if an entry has contents in the log attribute. Probably it's worth creating a checkbox attribute that will control the thing I want, or is there still some other ways of doing that?