<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_string_plus_property_value(value):
 # type: (Any) -> Optional[List[str]] """ Converts a string or list of string into a list of strings :param value: A string or a list of strings :return: A list of strings or None """

    if value:
        if isinstance(value, str):
            return [value]
        if isinstance(value, list):
            return value
        if isinstance(value, tuple):
            return list(value)

    return None