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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_tag_list(resource_tag_dict):
 """ Transforms the SAM defined Tags into the form CloudFormation is expecting. SAM Example: ``` Tags: TagKey: TagValue ``` CloudFormation equivalent: - Key: TagKey Value: TagValue ``` :param resource_tag_dict: Customer defined dictionary (SAM Example from above) :return: List of Tag Dictionaries (CloudFormation Equivalent from above) """

    tag_list = []
    if resource_tag_dict is None:
        return tag_list

    for tag_key, tag_value in resource_tag_dict.items():

        tag = {_KEY: tag_key, _VALUE: tag_value if tag_value else ""}
        tag_list.append(tag)

    return tag_list