Obi made it a rule in a Comic Contest, and now everyone's doing it. As far as I know, it's not a bug.
While I'm a big fan of the idea that a work should be able to stand on its own merits without a title, I'm an even bigger fan of being able to find the comic I'm looking for in a list, so I still usually title my strips.
You should be able to work around this by replacing any comic titles which contain nothing but whitespace with a non-breaking space or two before printing them out as search results. Or, if you're lazy, just replace all whitespace characters in titles with an nbsp. Either method should work.
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The what mentioned above is total fiction. Please don't take it seriously!