code: def test_notebook_with_empty_header_1070(
      md="""---
  
  ---
  
  This file has empty frontmatter.
  """,
  ):
      nb = jupytext.reads(md, fmt="md:markdown")
      md2 = jupytext.writes(nb, "md")
      compare(md2, md)
      nb2 = jupytext.reads(md, "md")
      compare_notebooks(nb2, nb)
  
imports: from nbformat.v4.nbbase import new_code_cell, new_markdown_cell, new_notebook, new_raw_cell
  import jupytext
  from jupytext.combine import combine_inputs_with_outputs
  from jupytext.compare import compare, compare_cells, compare_notebooks
label_desc: Use image node_id 37 for calling a global function with example usage: test_notebook_with_empty_header_1070(md) without return types