skip if the SAGA folder is not defined

Gustry · alexbruy · commit 4923e46a6d1c · 2017-01-24T15:08:24.000+02:00
(cherry picked from commit d9d5bf7)
diff --git a/python/plugins/processing/algs/saga/SagaUtils.py b/python/plugins/processing/algs/saga/SagaUtils.py
@@ -72,7 +72,7 @@ def findSagaFolder():
 
 def sagaPath():
     folder = ProcessingConfig.getSetting(SAGA_FOLDER)
-    if not os.path.isdir(folder):
+    if folder and not os.path.isdir(folder):
         folder = None
         ProcessingLog.addToLog(ProcessingLog.LOG_WARNING,
                                'Specified SAGA folder does not exist. Will try to find built-in binaries.')
