Add testRollbackNoTransaction for MaxDB

"Make rollback() and commit() no ops when no transaction is active"
was merged on stable-1.7 which does not have support for MaxDB, and
thus the test for MaxDB was omitted.

This commit adds the necessary test.

Change-Id: I6633c490d4cbdaca5d0d400b1cd3fddb7bb45bad

src/test/java/com/google/gwtorm/schema/sql/DialectMaxDBTest.java

diff --git a/src/test/java/com/google/gwtorm/schema/sql/DialectMaxDBTest.java b/src/test/java/com/google/gwtorm/schema/sql/DialectMaxDBTest.java
index 2eb8cf4..a1f6676 100644
--- a/src/test/java/com/google/gwtorm/schema/sql/DialectMaxDBTest.java
+++ b/src/test/java/com/google/gwtorm/schema/sql/DialectMaxDBTest.java
@@ -348,6 +348,19 @@
   }
 
   @Test
+  public void testRollbackNoTransaction() throws SQLException, OrmException {
+    PhoneBookDb schema = phoneBook.open();
+    schema.updateSchema(executor);
+    ArrayList<Person> all = new ArrayList<Person>();
+    all.add(new Person(new Person.Key("Bob"), 18));
+    schema.people().insert(all);
+    schema.commit();
+    schema.rollback();
+    List<Person> r = schema.people().olderThan(10).toList();
+    assertEquals(1, r.size());
+  }
+
+  @Test
   public void testCommitTransaction() throws SQLException, OrmException {
     PhoneBookDb schema = phoneBook.open();
     schema.updateSchema(executor);