`DRTEST_DATA` without `DRTEST_TEST` raises cryptic error message

[maltekliemann]

The following test raises a strange error message:

DRTEST_DATA(data_without_test)
{
}

// DRTEST_TEST(data_without_test)
// {
// }

The error message is:

TEST   data_without_test
*FAIL  data_without_test: std::exception

The throw is fine, but the error message should be more verbose.