Bug 136241 [regression]Preview template in web viewer and pdf didn't get correct effect.
Description: Preview template items in web viewer and pdf didn't get correct effect. Steps to reproduce: 1. Create template items. 2. Preview in Web Viewer and pdf. Expected result: Same effect as in html. Actual result: In web viewer, see only blank box. In pdf, blank page.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ContentCommand.java
for ( int slotID = 0; slotID < slotCount; slotID++ )
		{
			ContainerSlot slot = obj.getSlot( slotID );
			ContentCommand contentCmd = new ContentCommand( module, obj );
			while ( !slot.isEmpty( ) )
			{
				DesignElement content = slot.getContent( 0 );
				contentCmd.doRemove( content, slotID, false, true );
			}
		}
	}
	/**
	 * Moves an element from one slot to another at the specified position. The
	 * destination slot can be in the same element (unusual) or a different
	 * element (usual case). Use the other form of this method to move an
	 * element within the same slot.
	 * 
	 * @param content
	 *            the element to move.
	 * @param fromSlotID
	 *            the old slot location within the container item associated
	 *            with this command.
	 * @param to
	 *            the new container.
	 * @param toSlotID
	 *            the slot within the new container.
	 * @param newPos
	 *            the position in the target slot to which the content will be
	 *            moved. If it is -1 or greater than the size of the target
	 *            slot, the content will be appended at the end of the slot.