colmena build --evaluator streaming doesnt build anything

`colmena build --evaluator streaming --on Host_1,Host_2` doesnt build anything

Log:
```
 INFO Enumerating nodes...
 INFO Selected 2 out of 9 hosts.
 WARN Streaming evaluation is an experimental feature
     (...) | Evaluating Host_1 and Host_2
     (...) | Evaluated Host_1 and Host_2
           | All done!
```

i would expect `colmena build` to build the evaluated system too