Bug 162167 Add API IResultIterator.isEmpty to Data Engine.
Current DTE api do not have a method that can be directly used to tell the client whether an IResultIterator is empty or not.We need to add this api for the convenience sake.
engine/org.eclipse.birt.report.engine.tests/test/org/eclipse/birt/report/engine/api/script/RowDataTest.java
}
		public Object evaluate( String expr )
		{
			
			try
			{
				return rs.getValue( expr );
			}
			catch ( BirtException e )
			{				
			}
			return null;
		}
		public Object evaluate( IBaseExpression expr )
		{
			
			return null;
		}
		public String getGroupId( int groupLevel )
		{
			
			return null;
		}
		
	}
	
	
	private class FakeResultIteratorTest implements IResultIterator