I don’t know – what I have is twentyten w/ responsive plugin but highly customized at my end with the CSS. I did however find this in the sidebar.php file:
/* When we call the dynamic_sidebar() function, it’ll spit out the widgets for that widget area. If it instead returns false, then the sidebar simply doesn’t exist, so we’ll hard-code in some default sidebar stuff just in case. */
so I”m guessing I can just delete it, even if I’m not using the primary widget area at all?