Bug 180608 [Regression]NPE throws out when preview the result in dataset[07]
Description: [Regression]NPE throws out when preview the result in dataset[07] Build number: 2.2.0.v20070403-0630 Steps to reproduce: 1, Use attached report 2, Edit Data Set 3, Preview the Data Set Expected result: The preview should be success Actual result: NPE throws out Error log:
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/executor/ResultClass.java
* @see org.eclipse.birt.data.engine.odi.IResultClass#existCloborBlob()
	 */
	public boolean hasClobOrBlob( ) throws DataException
	{
		return getResultClasstHelper( ).hasClobOrBlob( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.data.engine.odi.IResultClass#getClobIndexArray()
	 */
	public int[] getClobFieldIndexes( ) throws DataException
	{
		return getResultClasstHelper( ).getClobIndexArray( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.data.engine.odi.IResultClass#getBlobIndexArray()
	 */
	public int[] getBlobFieldIndexes( ) throws DataException
	{
		return getResultClasstHelper( ).getBlobIndexArray( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.data.engine.odi.IResultClass#getResultObjectHelper()
	 */
	public ResultClassHelper getResultClasstHelper( ) throws DataException