message: Don't try t gather from empty tensors
diff: @@ -154,6 +154,7 @@ class GatherOp : public OpKernel {
  Tensor* out = nullptr;
  OP_REQUIRES_OK(c, c->allocate_output(0, result_shape, &out));
  if (N == 0) return;
  + if (inner_size == 0) return;
  int64 bad_i = -1;
  auto indices_flat = indices.flat<Index>();
  