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
{
			this.rs = rs;
		}
		
		public IResultSet getParent( )
		{
			return null;
		}
		
		public DataSetID getID( )
		{
			
			return null;
		}
		public long getCurrentPosition( )
		{
			
			return 0;
		}
		public boolean skipTo( long rows )
		{
			
			return false;
		}
		public boolean next( )
		{
			
			return false;
		}
		public int getStartingGroupLevel( )