Merge pull request #1301 from marxin/fix-old-folder

clean-up .old folder if an exception happens

osc/core.py

@@ -444,7 +444,9 @@ class Serviceinfo:
                 msg = f'"{old_dir}" exists, please remove it'
                 raise oscerr.OscIOError(None, msg)
 
+        try:
             result = self._execute(dir, old_dir, callmode, singleservice, verbose)
+        finally:
             shutil.rmtree(old_dir)
         return result