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Documentation Changes:
Not Needed
Documentation Changes Summary:

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1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?

Issue Text:
Fix for TypeError caused by substraction between nulls when round_trip_time is None

```python
return [
> s for s in selection.server_descriptions if (s.round_trip_time - fastest) <= threshold
]
E TypeError: unsupported operand type(s) for -: 'NoneType' and 'NoneType'
```
Jira ticket: https://jira.mongodb.org/browse/PYTHON-4298
Linked to previous PR https://github.com/mongodb/mongo-python-driver/pull/1361