install 2.0 with pipeline but no Subvwersion.
Restart Jenkins
Logs contian the following Warning
Mar 31, 2016 5:58:34 PM hudson.ExtensionFinder$GuiceFinder$FaultTolerantScope$1 error WARNING: Failed to instantiate optional component org.jenkinsci.plugins.workflow.steps.scm.SubversionStep$DescriptorImpl; skipping
But that's really OK as the extension is optional - so does not need to be at WARNING level.