Remove test for scalar input, which is not supported
Remove test for scalar input, which is not supported

hvy/chainer,chainer/chainer,niboshi/chainer,okuta/chainer,aonotas/chainer,tkerola/chainer,ronekko/chainer,ktnyt/chainer,niboshi/chainer,wkentaro/chainer,jnishi/chainer,chainer/chainer,keisuke-umezawa/chainer,wkentaro/chainer,jnishi/chainer,keisuke-umezawa/chainer,hvy/chainer,wkentaro/chainer,chainer/chainer,okuta/chainer,rezoo/chainer,keisuke-umezawa/chainer,ktnyt/chainer,jnishi/chainer,niboshi/chainer,pfnet/chainer,ktnyt/chainer,anaruse/chainer,okuta/chainer,niboshi/chainer,hvy/chainer,ktnyt/chainer,chainer/chainer,jnishi/chainer,okuta/chainer,wkentaro/chainer,keisuke-umezawa/chainer,hvy/chainer