code: def test_multiple_empty_cells():
      nb = new_notebook(
          cells=[new_code_cell(), new_code_cell(), new_code_cell()],
          metadata={"jupytext": {"notebook_metadata_filter": "-all"}},
      )
      text = jupytext.writes(nb, "py:percent")
      expected = """# %%
  
  # %%
  
  # %%
  """
      compare(text, expected)
      nb2 = jupytext.reads(text, "py:percent")
      nb2.metadata = nb.metadata
      compare_notebooks(nb2, nb)
  
imports: import os
  import pytest
  from nbformat.v4.nbbase import new_code_cell, new_markdown_cell, new_notebook, new_raw_cell
  import jupytext
  from jupytext.compare import compare, compare_notebooks, notebook_model
label_desc: Use image node_id 8 for calling a global function with example usage: test_multiple_empty_cells() without return types