There's no reason to do a dumb attempt at stinging a has-been like Assange. Literally all it could do is hurt her (if it backfired and people took Assange seriously).
http://election.princeton.edu/todays-electoral-vote-histogra...
Hanlon's Razor says that if it looks like some dumb idiot ("small business owner") who thought he could hire Assange for his TV commercial and then got his jimmies rustled that Assange said no then it probably is that instead of an international conspiracy. But even if we're moving into conspiracy territory, Clinton doesn't have the motive here.
Just because a few Clinton supporters on Twitter who really don't like Assange think the allegation is worth crowing about and the Daily Kos has no journalistic standards and will print anything if it's a scoop doesn't mean Clinton is anything but a little worse off if this news cycle is about Assange.
It looks like Ecuador have also just published a press release about cutting his internet connection that's perfectly timed to distract from this too. So Clinton's in no way losing out here. She benefits from people believing that Assange is a pedo and no-one hears about part where it's an incompetent frameup. The taint from this will stick to anything Assange says about her in future.