Is it legitimate to call methods like this on a build after it has been deleted? I cannot find such a call in `MavenModuleSetBuild.delete` + `LogRotator.perform`, and when I try to obtain `b1a` by other means (such as `p.getNearestBuild(1)` to match what `MavenModuleSetBuild.getModuleBuilds` does), the error can no longer be reproduced. Unfortunately my logging does not say exactly what is happening so I have to speculate.