Fix error messages in get_fans
Fix error messages in get_fans

niboshi/chainer,pfnet/chainer,chainer/chainer,wkentaro/chainer,niboshi/chainer,okuta/chainer,keisuke-umezawa/chainer,niboshi/chainer,chainer/chainer,hvy/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,okuta/chainer,okuta/chainer,hvy/chainer,niboshi/chainer,wkentaro/chainer,wkentaro/chainer,chainer/chainer,wkentaro/chainer,tkerola/chainer,okuta/chainer,hvy/chainer,hvy/chainer,chainer/chainer