Ensure that the certificate path, as determind from user input, is valid.

def _validate_cert_path(name):
    '''
    Ensure that the certificate path, as determind from user input, is valid.
    '''
    cmd = r"Test-Path -Path '{0}'".format(name)

    if not ast.literal_eval(_cmd_run(cmd=cmd)):
        raise SaltInvocationError(r"Invalid path specified: {0}".format(name))