"Failed to rollback release" when no SNAPSHOT version was defined

When you have a project without SNAPSHOT versions the release and rollback functionality is broken. For example with our company POM we increment version whenever a change is done, snapshots are never used. When I try to release a new version with continuum the release-prepare fails, saying that no SNAPSHOT is defined. This could eventually be ok. But doing a rollback afterwards freeces the web-UI with an TaskExecutionException in the logs:

ERROR org.codehaus.plexus.taskqueue.execution.TaskQueueExecutor:rollback-release - Error executing task
org.codehaus.plexus.taskqueue.execution.TaskExecutionException: Failed to rollback release
at org.apache.maven.continuum.release.executors.RollbackReleaseTaskExecutor.execute(RollbackReleaseTaskExecutor.java:45)
at org.apache.maven.continuum.release.executors.AbstractReleaseTaskExecutor.executeTask(AbstractReleaseTaskExecutor.java:67)
at org.codehaus.plexus.taskqueue.execution.ThreadedTaskQueueExecutor$ExecutorRunnable$1.run(ThreadedTaskQueueExecutor.java:116)
at edu.emory.mathcs.backport.java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:442)
at edu.emory.mathcs.backport.java.util.concurrent.FutureTask.run(FutureTask.java:176)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:665)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:690)
at java.lang.Thread.run(Thread.java:595)
Caused by: org.apache.maven.shared.release.ReleaseExecutionException: Cannot restore from a missing backup POM: /srv/ci/continuum-1.1/apps/continuum/webapp/WEB-INF/working-director
y/13/pom.xml.releaseBackup
at org.apache.maven.shared.release.phase.RestoreBackupPomsPhase.restorePomBackup(RestoreBackupPomsPhase.java:90)
at org.apache.maven.shared.release.phase.RestoreBackupPomsPhase.execute(RestoreBackupPomsPhase.java:69)
at org.apache.maven.shared.release.DefaultReleaseManager.rollback(DefaultReleaseManager.java:248)
at org.apache.maven.continuum.release.executors.RollbackReleaseTaskExecutor.execute(RollbackReleaseTaskExecutor.java:40)
... 7 more