fix error when output file is not created

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@15577 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: brushtyler

python/plugins/GdalTools/tools/doContour.py

@@ -80,6 +80,6 @@ def getOutputFileName(self):
 
   def addLayerIntoCanvas(self, fileInfo):
       vl = self.iface.addVectorLayer(fileInfo.filePath(), "contour", "ogr")
-      if vl.isValid():
+      if vl != None and vl.isValid():
         if hasattr(self, 'lastEncoding'):
           vl.setProviderEncoding(self.lastEncoding)

python/plugins/GdalTools/tools/doPolygonize.py

@@ -81,6 +81,6 @@ def getOutputFileName(self):
 
   def addLayerIntoCanvas(self, fileInfo):
       vl = self.iface.addVectorLayer(fileInfo.filePath(), fileInfo.baseName(), "ogr")
-      if vl.isValid():
+      if vl != None and vl.isValid():
         if hasattr(self, 'lastEncoding'):
           vl.setProviderEncoding(self.lastEncoding)

python/plugins/GdalTools/tools/doTileIndex.py

@@ -69,6 +69,6 @@ def getOutputFileName( self ):
 
   def addLayerIntoCanvas( self, fileInfo ):
       vl = self.iface.addVectorLayer( fileInfo.filePath(), fileInfo.baseName(), "ogr" )
-      if vl.isValid():
+      if vl != None and vl.isValid():
         if hasattr( self, 'lastEncoding' ):
           vl.setProviderEncoding( self.lastEncoding )