check whether attributes are initialized on `__del__` in more pythonic manner, by catching `AttributeError` instead of inspecting `__dict__`
check whether attributes are initialized on `__del__` in more pythonic manner, by catching `AttributeError` instead of inspecting `__dict__`

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