Returns true if the row is a single length title element with no other row titles. Useful
        for tracking pre-data titles that belong in their own block.

def _single_length_title(self, table, row_index, current_col):
        '''
        Returns true if the row is a single length title element with no other row titles. Useful
        for tracking pre-data titles that belong in their own block.
        '''
        if len(table[row_index]) - current_col <= 0:
            return False
        return (is_text_cell(table[row_index][current_col]) and
                all(not is_text_cell(table[row_index][next_column])
                    for next_column in xrange(current_col + 1, len(table[row_index]))))