[sextante] fix obtaining vector layers

Author: alexbruy

python/plugins/sextante/core/QGisLayers.py

@@ -35,8 +35,8 @@ class QGisLayers:
     '''This class contains method to communicate SEXTANTE with the QGIS interface,
     mostly for retrieving layers and adding new ones to the QGIS canvas'''
 
-    ALL_TYPES = -1
-    iface = None;
+    ALL_TYPES = [-1]
+    iface = None
 
     @staticmethod
     def getSupportedOutputVectorLayerExtensions():