Bug 136553 [regression]Preview error when set invalid group interval.
Description: Preview error when set invalid group interval. Steps to reproduce: 1. Insert a table 2. Add a group on number column, set interval to Year,1 3. Preview 4. Edit group on string column set interval to Prefix,1 5. Preview Expected result: Error msg about invalid group interval. Actual result: Error happened while running the report
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/DataPresentationEngine.java
long rowId = IOUtil.readLong( dis );
				String queryId = IOUtil.readString( dis );
				String rsetId = IOUtil.readString( dis );
				buffer.setLength( 0 );
				buffer.append( pRsetId );
				buffer.append( "." );
				buffer.append( rowId );
				buffer.append( "." );
				buffer.append( queryId );
				rsetRelations.put( buffer.toString( ), rsetId );
			}
		}
		catch ( EOFException eofe )
		{
			
		}
		catch ( IOException ioe )
		{
			context.addException( new EngineException(
					"Can't load the data in report document", ioe ) );
			logger.log( Level.SEVERE, ioe.getMessage( ), ioe );
		}
		finally
		{
			if ( dis != null )
			{
				try
				{
					dis.close( );
				}