Exiting Designer when preview server NOT running results in connection exception

Was working on other defects and running Designer with my Server NOT running, even though I still had a default server defined in Designer.

Each time I exited Designer, I got the following because the preview manager's shutdown logic was calling a getAdmin() which lazily tries to create one. Need to do one more check to prevent exception.

1 [SingleInstanceCommunicationException]Error establishing socket to host and port: localhost:31443. Reason: Connection refused
2 [ConnectException]Connection refused
at org.teiid.adminapi.AdminFactory.createAdmin(AdminFactory.java:214)
at org.teiid.adminapi.AdminFactory.createAdmin(AdminFactory.java:199)
at org.teiid.adminapi.AdminFactory.createAdmin(AdminFactory.java:167)
at org.teiid.designer.runtime.Server.getAdmin(Server.java:129)
at org.teiid.designer.runtime.preview.PreviewManager.shutdown(PreviewManager.java:1409)
at org.teiid.designer.runtime.ServerManager.shutdown(ServerManager.java:511)
at com.metamatrix.modeler.dqp.ui.DqpUiPlugin$1.run(DqpUiPlugin.java:190)