Merge pull request #6219 from ThomasWaldmann/1.1-maint

if ensure_dir() fails, give more informative error message, fixes #5952

src/borg/helpers.py

@@ -528,7 +528,7 @@ def ensure_dir(path, mode=stat.S_IRWXU, pretty_deadly=True):
         os.makedirs(path, mode=mode, exist_ok=True)
     except OSError as e:
         if pretty_deadly:
-            raise Error(e.args[1])
+            raise Error(str(e))
         else:
             raise