Py3: Fix handling of empty requests

mpcdf_push.py

@@ -92,7 +92,7 @@ def do_mpcdf_push(self, subcmd, opts, *args):
                                                 message="Update {0} from {1}".format(package, from_project) if not opts.message else opts.message)
     except osc.core.HTTPError as e:
         if e.code == 400:
-            if "The request contains no actions" in e.read():
+            if "The request contains no actions" in mpcdf_common.decode_it(e.read()):
                 print("No source changes found, submit request not necessary")
         else:
             raise e