def _print_parameter_name_and_type(p_name, p_type):
    """
    Print parameter name and type following Numpy docstring standard.
    If `p_name` is an empty string, then return an empty string.

    Parameters
    ----------
    p_name: str
        Parameter name
    p_type: str
        Parameter type
    """
    s = ""
    if p_name:
        s = f"{p_name}"
        if p_type:
            s += f" : {p_type}"
    return f"{s}\n"