`estimateMetadataSeparation` with `space = "pseudo.bulk"` returns error

```
cao$estimateMetadataSeparation(space = "foo")
Error in match.arg(space) : 
  'arg' should be one of “expression.shifts”, “coda”, “pseudo.bulk”

```
but
```

cao$estimateMetadataSeparation(sample.meta = meta, space = "pseudo.bulk")
Error in self$getSampleDistanceMatrix(space = space, cell.type = NULL,  : 
  Not implemented space: pseudo.bulk!
```