[PATCH v15 2/5] dts: replace the or operator in third party types

[Juraj Linkeš]

When the DTS dependencies are not installed when building DTS API
documentation, the or operator produces errors when used with types from
those libraries:
autodoc: failed to import module 'remote_session' from module
'framework'; the following exception was raised:
Traceback (most recent call last):
...
TypeError: unsupported operand type(s) for |: 'Transport' and 'NoneType'

The third part type here is Transport from the paramiko library.

Signed-off-by: Juraj Linkeš <juraj.lin...@pantheon.tech>
---
 dts/framework/remote_session/interactive_remote_session.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dts/framework/remote_session/interactive_remote_session.py 
b/dts/framework/remote_session/interactive_remote_session.py
index 97194e6af8..4605ee14b4 100644
--- a/dts/framework/remote_session/interactive_remote_session.py
+++ b/dts/framework/remote_session/interactive_remote_session.py
@@ -5,6 +5,7 @@
 
 import socket
 import traceback
+from typing import Union
 
 from paramiko import AutoAddPolicy, SSHClient, Transport  # type: 
ignore[import-untyped]
 from paramiko.ssh_exception import (  # type: ignore[import-untyped]
@@ -52,7 +53,7 @@ class InteractiveRemoteSession:
     session: SSHClient
     _logger: DTSLogger
     _node_config: NodeConfiguration
-    _transport: Transport | None
+    _transport: Union[Transport, None]
 
     def __init__(self, node_config: NodeConfiguration, logger: DTSLogger) -> 
None:
         """Connect to the node during initialization.
-- 
2.34.1