fix: ignore statement without object id

[Ian2012]

Description: Do not try to send events without an object.id

Testing instructions:

1. Open page A
2. Do thing B
3. Expect C to happen
4. If D happened instead - check failed.

Merge checklist:

• All reviewers approved
• CI build is green
• Version bumped
• Changelog record added
• Documentation updated (not only docstrings)
• Commits are squashed

Post merge:

• Create a tag
• Check new version is pushed to PyPI after tag-triggered build is
  finished.

Author concerns: List any concerns about this PR - inelegant
solutions, hacks, quick-and-dirty implementations, concerns about
migrations, etc.

[bmtcril]

This is where the fix was placed, in case anyone comes looking:

event-routing-backends/event_routing_backends/processors/xapi/transformer_processor.py

Line 50 in 46ba27a

if not transformed_event.object or not transformed_event.object.id: