Haven't tried this but how about making a new category with a space as its name, just assign all posts to that category. Bit of a bodge but if you don't want to get your hands dirty it may be worth a go.
In order for me to do some weird things with my content in Wordpress one of my sites needs a unique category for each post (I just use a number). To hide them I used the method in the link below:
Basically it's a small piece of PHP code you can drop directly into your functions.php file. You then add categories to the "hide" list by adding their category ID's to the code.
I'm no PHP pro but I found this one pretty easy to implement and it works great for me without adding another plugin to an already pretty bloated site.
But on the other hand there are a lot of "hide category" type plugins lying around - google up some of those if you want to go that route.
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