[processing] some SAGA fixes

-fixed raster export
-fixed version numbering when no saga installation is found

python/plugins/processing/algs/saga/SagaAlgorithm212.py

@@ -304,8 +304,12 @@ class SagaAlgorithm212(GeoAlgorithm):
     def exportRasterLayer(self, source):
         global sessionExportedLayers
         if source in sessionExportedLayers:
-            self.exportedLayers[source] = sessionExportedLayers[source]
-            return None
+            exportedLayer = sessionExportedLayers[source]
+            if os.path.exists(exportedLayer):
+                self.exportedLayers[source] = exportedLayer
+                return None
+            else:
+                del sessionExportedLayers[source]
         layer = dataobjects.getObjectFromUri(source, False)
         if layer:
             filename = str(layer.name())

python/plugins/processing/algs/saga/SagaAlgorithm213.py

@@ -42,7 +42,6 @@ from processing.tools.system import *
 
 sessionExportedLayers = {}
 
-
 class SagaAlgorithm213(SagaAlgorithm212):
 
     OUTPUT_EXTENT = 'OUTPUT_EXTENT'
@@ -225,11 +224,15 @@ class SagaAlgorithm213(SagaAlgorithm212):
     def exportRasterLayer(self, source):
         global sessionExportedLayers
         if source in sessionExportedLayers:
-            self.exportedLayers[source] = sessionExportedLayers[source]
-            return None
+            exportedLayer = sessionExportedLayers[source]
+            if os.path.exists(exportedLayer):
+                self.exportedLayers[source] = exportedLayer
+                return None
+            else:
+                del sessionExportedLayers[source]
         layer = dataobjects.getObjectFromUri(source, False)
         if layer:
-            filename = str(layer.name())
+            filename = layer.name()
         else:
             filename = os.path.basename(source)
         validChars = \

python/plugins/processing/algs/saga/SagaAlgorithmProvider.py

@@ -102,7 +102,8 @@ class SagaAlgorithmProvider(AlgorithmProvider):
             ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
                 self.tr('Could not open SAGA algorithm: %s\n%s' % (descriptionFile, str(e))))
     def getDescription(self):
-        return 'SAGA (%s)' % SagaUtils.getSagaInstalledVersion()
+        version = SagaUtils.getSagaInstalledVersion()
+        return 'SAGA (%s)' %  version if version is not None else 'SAGA'
 
     def getName(self):
         return 'saga'

python/plugins/processing/algs/saga/SagaUtils.py

@@ -27,7 +27,6 @@ __revision__ = '$Format:%H$'
 
 import os
 import stat
-import traceback
 import subprocess
 from PyQt4.QtCore import *
 from qgis.core import *