def merge_info(frontend_info, default_info):
    """
    合并前端传入的 info 和默认 info
    规则：如果前端传入的值为空（None 或空字符串），则使用默认值
    
    Args:
        frontend_info: 前端传入的字典
        default_info: 默认的完整字典
    Returns: 
        合并后的完整字典
    """
    if not isinstance(frontend_info, dict) or frontend_info is None:
        return default_info

    merged_info = {}
    
    for key, default_value in default_info.items():
        # 获取前端传入的值
        frontend_value = frontend_info.get(key)
        
        # 判断前端值是否为空（None 或空字符串）
        if frontend_value is None or frontend_value == "":
            merged_info[key] = default_value
        else:
            merged_info[key] = frontend_value
    
    return merged_info