如何将空值从属性文件添加到Map

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import java.io.FileInputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

public class PropertyFileToMap {
    public static void main(String[] args) {
        Properties properties = new Properties();
        try {
            properties.load(new FileInputStream("config.properties"));
        } catch (IOException e) {
            e.printStackTrace();
        }

        Map<String, String> map = new HashMap<>();
        for (String key : properties.stringPropertyNames()) {
            String value = properties.getProperty(key);
            map.put(key, value);
        }

        System.out.println(map);
    }
}

{name=}