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 int getRowIndex( ) throws BirtException
		{
			return 0;
		}
		public void moveTo( int rowIndex ) throws BirtException
		{
		}
		public Object getValue( String name ) throws BirtException
		{
			return expressions.get( name );
		}
		public Boolean getBoolean( String name ) throws BirtException
		{
			
			return null;
		}
		public Integer getInteger( String name ) throws BirtException
		{
			
			return null;
		}
		public Double getDouble( String name ) throws BirtException
		{
			
			return null;
		}
		public String getString( String name ) throws BirtException
		{