Fix get_tensor_desc for zero-dim array
Fix get_tensor_desc for zero-dim array

rezoo/chainer,keisuke-umezawa/chainer,jnishi/chainer,pfnet/chainer,aonotas/chainer,sinhrks/chainer,hvy/chainer,niboshi/chainer,niboshi/chainer,cupy/cupy,delta2323/chainer,ronekko/chainer,kikusu/chainer,chainer/chainer,ysekky/chainer,AlpacaDB/chainer,chainer/chainer,umitanuki/chainer,Kaisuke5/chainer,cemoody/chainer,sinhrks/chainer,anaruse/chainer,ktnyt/chainer,wkentaro/chainer,hvy/chainer,muupan/chainer,benob/chainer,truongdq/chainer,jnishi/chainer,keisuke-umezawa/chainer,tigerneil/chainer,ikasumi/chainer,sou81821/chainer,wkentaro/chainer,kashif/chainer,laysakura/chainer,kikusu/chainer,jnishi/chainer,keisuke-umezawa/chainer,okuta/chainer,hvy/chainer,wavelets/chainer,cupy/cupy,ytoyama/yans_chainer_hackathon,ktnyt/chainer,wkentaro/chainer,kuwa32/chainer,t-abe/chainer,minhpqn/chainer,okuta/chainer,tkerola/chainer,tscohen/chainer,niboshi/chainer,okuta/chainer,yanweifu/chainer,t-abe/chainer,ktnyt/chainer,niboshi/chainer,AlpacaDB/chainer,jnishi/chainer,chainer/chainer,cupy/cupy,cupy/cupy,masia02/chainer,hidenori-t/chainer,1986ks/chainer,muupan/chainer,benob/chainer,hvy/chainer,woodshop/chainer,chainer/chainer,ktnyt/chainer,kiyukuta/chainer,wkentaro/chainer,okuta/chainer,keisuke-umezawa/chainer,truongdq/chainer,woodshop/complex-chainer