"given" is the wrong wording. A quick look at the sources reveals that the caller is 
```python
self._build_hosts(affected_hosts)```
so the edge case is that pysvn did not find any "touched" hosts that need rebuilding. So IMHO it is more like a "You want me to build RPMs, but that's not necessary since the changeset does not affect anything, so I'll stop right there"-ish type of message.