如何将可能存在格式错误的xml解析为dataframe？

import pandas as pd
import xml.etree.ElementTree as ET

def parse_xml_to_dataframe(xml_string):
    try:
        root = ET.fromstring(xml_string)
        data = []
        for child in root:
            row = {}
            for sub_child in child:
                row[sub_child.tag] = sub_child.text
            data.append(row)
        df = pd.DataFrame(data)
        return df
    except ET.ParseError:
        return pd.DataFrame()

xml_string = "<root><item><name>John</name><age>25</age></item><item><name>Alice</name><age>30</age></item></root>"
df = parse_xml_to_dataframe(xml_string)

   name age
0  John  25
1 Alice  30