[Processing][Grass] Add the possibility to return a shp if ogr is not compiled with gpkg

(cherry picked from commit 2e92dab)

Author: lbartoletti

python/plugins/processing/algs/grass7/Grass7AlgorithmProvider.py

@@ -138,7 +138,13 @@ def svgIconPath(self):
         return QgsApplication.iconPath("/providerGrass.svg")
 
     def defaultVectorFileExtension(self, hasGeometry=True):
-        return 'gpkg'
+        # By default,'gpkg', but if OGR has not been compiled with sqlite3, then
+        # we take "SHP"
+        if 'GPKG' in [o.driverName for o in
+                      QgsVectorFileWriter.ogrDriverList()]:
+            return 'gpkg'
+        else:
+            return 'shp' if hasGeometry else 'dbf'
 
     def supportsNonFileBasedOutput(self):
         """