code: def empty_kernel(null, BLOCK_M: tl.constexpr, BLOCK_N: tl.constexpr):
      pass
  
imports: import itertools
  import pytest
  import torch
  from torch.testing import assert_close
  import triton
  import triton.language
  from triton.runtime import driver
label_desc: Use image node_id 1 for calling a global function with example usage: empty_kernel(null, BLOCK_M, BLOCK_N) without return types