Changes for JIRA OPENJPA-116 issue.

Added a test to ensure that the EntityManager was still open before executing the getDelegate() code.

git-svn-id: https://svn.apache.org/repos/asf/incubator/openjpa/trunk@501445 13f79535-47bb-0310-9956-ffa450edef68

openjpa-persistence/src/main/java/org/apache/openjpa/persistence/EntityManagerImpl.java

@@ -853,6 +853,7 @@ public class EntityManagerImpl
     }
 
     public Object getDelegate() {
+        _broker.assertOpen();
         return this;
     }
 
@@ -1104,5 +1105,5 @@ public class EntityManagerImpl
         if (!(other instanceof EntityManagerImpl))
             return false;
         return _broker.equals(((EntityManagerImpl) other)._broker);
-	}
+    }
 }