code: def find_unassigned_table_cell(table):
      
      for row in range(len(table)):
          for column in range(len(table[row])):
              if table[row][column] is None:
                  return row, column
      return row, column
docs: Search through a table and return the first [row, column] pair
      who's value is None.
  
      Parameters
      ----------
      table : list of lists of str
  
      Returns
      -------
      list of int
          The row column pair of the None type cell