CassandraStore's schemaExists() method always returns false

CassandraStore's schemaExisst() method always returns false.

public boolean schemaExists() throws IOException

It makes gora-cassandra testSchemaExists fail.
https://issues.apache.org/jira/browse/GORA-53?focusedCommentId=13414694#comment-13414694

testSchemaExists(org.apache.gora.cassandra.store.TestCassandraStore) Time elapsed: 0.883 sec <<< FAILURE!
junit.framework.AssertionFailedError
at junit.framework.Assert.fail(Assert.java:48)
at junit.framework.Assert.assertTrue(Assert.java:20)
at junit.framework.Assert.assertTrue(Assert.java:27)
at org.apache.gora.store.DataStoreTestUtil.testSchemaExists(DataStoreTestUtil.java:131)
at org.apache.gora.store.DataStoreTestBase.testSchemaExists(DataStoreTestBase.java:164)