fix(opentelemetry): Handle None span context

[alexander-alderman-webb]

Description

Exit early if there is no span context, as there is no trace_id or span_id to create a Sentry span in this case.

The context of ReadableSpan is optional: https://github.com/open-telemetry/opentelemetry-python/blob/73d65fd2e90a2547c5c78eef1fdfcb21076a930d/opentelemetry-sdk/src/opentelemetry/sdk/trace/__init__.py#L420

Issues

Reminders

• Please add tests to validate your changes, and lint your code using tox -e linters.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

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New Features ✨

• (ai) Redact base64 data URLs in image_url content blocks by ericapisani in #5953
• (integrations) Instrument pyreqwest tracing by servusdei2018 in #5682

Bug Fixes 🐛

Anthropic

• Stop setting transaction status when child span fails by alexander-alderman-webb in #5717
• Only finish relevant spans in .create() patches by alexander-alderman-webb in #5716

Other

• (opentelemetry) Handle None span context by alexander-alderman-webb in #5968

• (wsgi) Respect HTTP_X_FORWARDED_PROTO in request.url construction by sl0thentr0py in #5963

Internal Changes 🔧

• (anthropic) Separate sync and async .create() patches by alexander-alderman-webb in #5715
• (openai) Split token counting by API for easier deprecation by ericapisani in #5930
• (opentelemetry) Ignore mypy error by alexander-alderman-webb in #5927
• Pin tokenizers version for anthropic tests on Python 3.8 by alexander-alderman-webb in #5967
• Fix license metadata in setup.py by sl0thentr0py in #5934
• Update validate-pr workflow by stephanie-anderson in #5931

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[github-actions]

Codecov Results 📊

✅ 13 passed | Total: 13 | Pass Rate: 100% | Execution Time: 8.60s

All tests are passing successfully.

❌ Patch coverage is 0.00%. Project has 14845 uncovered lines.

Files with missing lines (1)

File	Patch %	Lines
span_processor.py	0.00%	⚠️ 205 Missing

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