Throw exeception when runtime is not active

[lifflander]

Describe the bug
Right now, we aren't throwing if the runtime is not active, which occurs in the nompi tests.

Also, if it doesn't already work this way, we want to enable throwing on non-CI builds for all tests. But, we don't want to compile two different versions of the VT code. So this might be a bit tricky.

template <runtime::RuntimeInstType instance>
void CollectiveAnyOps<instance>::abort(
  std::string const str, ErrorCodeType const code
) {
  auto tls_rt = curRT;
  auto myrt = tls_rt ? tls_rt : ::vt::rt;
  if (myrt) {
#if vt_check_enabled(trace_enabled)
    //--- Try to flush most of the traces before aborting
    myrt->theTrace->cleanupTracesFile();
#endif
    myrt->abort(str, code);
  } else {
    std::_Exit(code);
  }

}