[processing] Fix handling of None shapeEncoding

Fixes #15719 -- object of type 'NoneType' has no len()

Author: strk

python/plugins/processing/algs/gdal/ogr2ogrtopostgislist.py

@@ -211,7 +211,7 @@ def getConsoleCommands(self):
         arguments = []
         arguments.append('-progress')
         arguments.append('--config PG_USE_COPY YES')
-        if len(shapeEncoding) > 0:
+        if shapeEncoding:
             arguments.append('--config')
             arguments.append('SHAPE_ENCODING')
             arguments.append('"' + shapeEncoding + '"')