code: def test_empty_layout():
      """Test that tight layout doesn't cause an error when there are no Axes."""
      fig = plt.gcf()
      fig.tight_layout()
  
imports: import warnings
  import numpy
  from numpy.testing import assert_array_equal
  import pytest
  import matplotlib
  from matplotlib.testing.decorators import image_comparison
  import matplotlib.pyplot
  from matplotlib.offsetbox import AnchoredOffsetbox, DrawingArea
  from matplotlib.patches import Rectangle
label_desc: Use image node_id 14 for calling a global function with example usage: test_empty_layout() without return types