如何处理Mergerly中的空LHS

def merge_data(lhs, rhs):
    if not lhs:
        return rhs  # 如果LHS为空，直接返回RHS
    # 合并逻辑
    return merged_data

def merge_data(lhs, rhs):
    if not lhs:
        lhs = {}  # 设置默认值
    # 合并逻辑
    return merged_data

def merge_data(lhs, rhs):
    if not lhs:
        return rhs  # 如果LHS为空，直接返回RHS
    else:
        # 正常合并逻辑
        for key, value in rhs.items():
            if key not in lhs:
                lhs[key] = value
            else:
                # 处理冲突逻辑
                pass
    return lhs

import logging

def merge_data(lhs, rhs):
    if not lhs:
        logging.warning("LHS is empty, merging with RHS")
        return rhs
    # 合并逻辑
    return merged_data