def get_indent(row):
  """Get indent of row's first cell (that is, left edge of bounding box in px).
  
  Parameters:
    row (list): List of PDF Extraction-type cells
    
  Returns:
    float
  """
  if len(row) > 0 and row[0]["bbox"] is not None:
      return row[0]["bbox"][0]
  else:
      return 0.0