code: def test_block_empty(self):
      conv = ConvDenseBlock(
          spatial_dims=3, in_channels=self.input_channels, channels=[]
      )
      out = conv(self.imt)
      expected_shape = self.imt.shape
      self.assertEqual(out.shape, expected_shape)
  
imports: from __future__ import annotations
  import unittest
  import torch.nn
  from monai.networks.blocks import ConvDenseBlock, DenseBlock
  from tests.utils import TorchImageTestCase2D, TorchImageTestCase3D
label_desc: Use image node_id 1 for calling the TestConvDenseBlock3D obj's underlying member method code with example usage: obj.test_block_empty() without return types