storage: keep non-utf8 strings as bytes (#38021)

(this is not supposed to exist)

wcs/qommon/storage.py

@@ -114,7 +114,10 @@ def deep_bytes2str(obj, seen=None):
     if id(obj) in seen:
         return obj
     if isinstance(obj, bytes):
-        return obj.decode('utf-8')
+        try:
+            return obj.decode('utf-8')
+        except UnicodeDecodeError:
+            return obj
     seen[id(obj)] = True
     if isinstance(obj, dict):
         new_d = {}