IET_old_name-fix

@@ -386,10 +386,15 @@ class LVMISCSIDriver(LVMVolumeDriver, driver.ISCSIDriver):
 
         # NOTE(jdg): For TgtAdm case iscsi_name is the ONLY param we need
         # should clean this all up at some point in the future
-        self.tgtadm.create_iscsi_target(iscsi_name, iscsi_target,
-                                        0, volume_path, chap_auth,
-                                        check_exit_code=False,
-                                        old_name=old_name)
+        if old_name is None:
+            self.tgtadm.create_iscsi_target(iscsi_name, iscsi_target,
+                                            0, volume_path, chap_auth,
+                                            check_exit_code=False)
+        else:
+            self.tgtadm.create_iscsi_target(iscsi_name, iscsi_target,
+                                            0, volume_path, chap_auth,
+                                            check_exit_code=False,
+                                            old_name=old_name)