Add inject_backend_config parameter check
Add inject_backend_config parameter check

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