如何让空值不存储在Pandas Python的HBase中？

import pandas as pd
from hbase import HbaseClient

data = {'Column1': [1, 2, None, 4, 5],
        'Column2': ['A', 'B', 'C', None, 'E']}
df = pd.DataFrame(data)

df = df.dropna()

hbase_data = []
for index, row in df.iterrows():
    hbase_row = {'row_key': str(index)}
    for column, value in row.items():
        hbase_row[column] = str(value)
    hbase_data.append(hbase_row)

client = HbaseClient(host='your_hbase_host', port=9090)
table = client.table('your_table_name')
table.put(hbase_data)