[libchamplain] Return XSRETURN_EMPTY if champlain_polygon_get_points() has no points

[Pierre-Luc Beaudoin <plbeaudoin src gnome org>]

commit a1f1d457290c3b27dc5bd4d0258767df0d7cd6e1
Author: Emmanuel Rodriguez <emmanuel rodriguez gmail com>
Date:   Wed Jul 8 23:11:32 2009 +0200

    Return XSRETURN_EMPTY if champlain_polygon_get_points() has no points

 bindings/perl/Champlain/xs/ChamplainPolygon.xs |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/bindings/perl/Champlain/xs/ChamplainPolygon.xs b/bindings/perl/Champlain/xs/ChamplainPolygon.xs
index 4bec9e4..c6e28f5 100644
--- a/bindings/perl/Champlain/xs/ChamplainPolygon.xs
+++ b/bindings/perl/Champlain/xs/ChamplainPolygon.xs
@@ -28,7 +28,11 @@ champlain_polygon_get_points (ChamplainPolygon *polygon)
 	
 	PPCODE:
 		item = champlain_polygon_get_points(polygon);
-		
+
+		if (!item) {
+			XSRETURN_EMPTY;
+		}
+
 		for (; item != NULL; item = item->next) {
 			ChamplainPoint *point = CHAMPLAIN_POINT(item->data);
 			XPUSHs(sv_2mortal(newSVChamplainPoint(point)));