minor change to avoid showing non-file-based layers

git-svn-id: http://sextante.googlecode.com/svn/trunk/soft/bindings/qgis-plugin@51 881b9c09-3ef8-f3c2-ec3d-21d735c97f4d

Author: volayaf

src/sextante/core/QGisLayers.py

@@ -4,6 +4,7 @@
 from PyQt4 import QtCore, QtGui
 from os import path
 from sextante.core.SextanteConfig import SextanteConfig
+import os.path
 
 class QGisLayers:
 
@@ -17,7 +18,8 @@ def getRasterLayers():
 
         for layer in layers:
             if layer.type() == layer.RasterLayer:
-                raster.append(layer)
+                if os.path.exists(layer.source()):
+                    raster.append(layer)
         return raster
 
     @staticmethod
@@ -27,7 +29,8 @@ def getVectorLayers(shapetype=-1):
         for layer in layers:
             if layer.type() == layer.VectorLayer:
                 if shapetype == QGisLayers.ALL_TYPES or layer.geometryType() == shapetype:
-                    vector.append(layer)
+                    if os.path.exists(layer.source()):
+                        vector.append(layer)
         return vector
 
     @staticmethod