RE: No default value, but prompt says there is one: customize-variable

[Drew Adams]

    > Put cursor on this text in some buffer: Buffer-menu-mode-width.
    >
    > M-x customize-variable
    >
    > The prompt says that the default is Buffer-menu-mode-width, but
    > completing-read is called with a nil DEF value, and you cannot pull
    > Buffer-menu-mode-width into the minibuffer with M-n.
    
    Thanks.  I fixed this.
    
Thanks. (That was quick!)