Return the text lines with the references cut.

def cut_references(text_lines):
    """Return the text lines with the references cut."""
    ref_sect_start = find_reference_section(text_lines)
    if ref_sect_start is not None:
        start = ref_sect_start["start_line"]
        end = find_end_of_reference_section(text_lines, start,
                                            ref_sect_start["marker"],
                                            ref_sect_start["marker_pattern"])
        del text_lines[start:end + 1]
    else:
        current_app.logger.warning("Found no references to remove.")
        return text_lines

    return text_lines