Fix AttributeError when build.version is None in telemetry collection (#12572)
## Summary
Fixes an AttributeError that occurs when collecting telemetry data for
builds where the version has been deleted.
## Details
The `Build.version` field is nullable (`null=True`,
`on_delete=models.SET_NULL`), which means it can be `None` when a
version is deleted. The telemetry data collection code was attempting to
access `build.version.id` without checking for `None`, causing an
AttributeError.
## Fixes
https://read-the-docs.sentry.io/issues/6296397769/