[processing] extra checks to avoid issues with previous versions values

Author: volaya

python/plugins/processing/algs/grass/GrassUtils.py

@@ -87,6 +87,8 @@ def grassPath():
             return ''
 
         folder = ProcessingConfig.getSetting(GrassUtils.GRASS_FOLDER)
+        if not os.path.exists(folder):
+            folder = None
         if folder is None:
             if isWindows():
                 testfolder = os.path.dirname(QgsApplication.prefixPath())
@@ -106,6 +108,8 @@ def grassPath():
     @staticmethod
     def grassWinShell():
         folder = ProcessingConfig.getSetting(GrassUtils.GRASS_WIN_SHELL)
+        if not os.path.exists(folder):
+            folder = None
         if folder is None:
             folder = os.path.dirname(unicode(QgsApplication.prefixPath()))
             folder = os.path.join(folder, 'msys')

python/plugins/processing/algs/grass7/Grass7Utils.py

@@ -85,6 +85,8 @@ def grassPath():
             return ''
 
         folder = ProcessingConfig.getSetting(Grass7Utils.GRASS_FOLDER)
+        if not os.path.exists(folder):
+            folder = None
         if folder is None:
             if isWindows():
                 testfolder = os.path.dirname(unicode(QgsApplication.prefixPath()))
@@ -104,6 +106,8 @@ def grassPath():
     @staticmethod
     def grassWinShell():
         folder = ProcessingConfig.getSetting(Grass7Utils.GRASS_WIN_SHELL)
+        if not os.path.exists(folder):
+            folder = None
         if folder is None:
             folder = os.path.dirname(unicode(QgsApplication.prefixPath()))
             folder = os.path.join(folder, 'msys')

python/plugins/processing/algs/r/RUtils.py

@@ -56,16 +56,23 @@ def RLibs():
         folder = ProcessingConfig.getSetting(RUtils.R_LIBS_USER)
         if folder is None:
             folder = unicode(os.path.join(userFolder(), 'rlibs'))
-        mkdir(folder)
-
+        try:
+            mkdir(folder)
+        except:
+            folder = unicode(os.path.join(userFolder(), 'rlibs'))
+            mkdir(folder)
         return os.path.abspath(unicode(folder))
 
     @staticmethod
     def RScriptsFolder():
         folder = ProcessingConfig.getSetting(RUtils.RSCRIPTS_FOLDER)
         if folder is None:
             folder = unicode(os.path.join(userFolder(), 'rscripts'))
-        mkdir(folder)
+        try:
+            mkdir(folder)
+        except:
+            folder = unicode(os.path.join(userFolder(), 'rscripts'))
+            mkdir(folder)
 
         return os.path.abspath(folder)