NPE in JDBCStoreManager

The attached patch fixes:

12:44:39,248 ERROR [EntityContainer] Stopping failed jboss.j2ee:jndiName=ejb/UserLocal,service=EJB
java.lang.NullPointerException
at org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager.stop(JDBCStoreManager.java:507)
at org.jboss.ejb.plugins.CMPPersistenceManager.stop(CMPPersistenceManager.java:162)
at org.jboss.ejb.EntityContainer.stopService(EntityContainer.java:384)
at org.jboss.system.ServiceMBeanSupport.jbossInternalStop(ServiceMBeanSupport.java:320)
at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:224)

during a shutdown of an unsuccesful deployment.