If the slave that build the most-recent build on an accurev project goes offline, the project rebuilds, even if no changes happened and hence no rebuild is required.

JENKINS-1348 describes (and fixed) an issue whereby builds would be triggered if the slave that did the last build went offline (even temporarily). The fix extended the SCM base class and then relied on SCM implementations to override that behaviour where appropriate.
However, no corresponding change was made to the accurev plugin.

The accurev plugin code needs to implement requiresWorkspaceForPolling() and return false (as its polling method doesn't rely on a workspace).