fix(mcp): Add None checks

[alexander-alderman-webb]

Description

sentry_sdk/integrations/mcp.py:499: error: Item "None" of "Any | None" has no attribute "scheme"  [union-attr]
sentry_sdk/integrations/mcp.py:642: error: Item "None" of "Any | None" has no attribute "_get_prompt_mcp"  [union-attr]
sentry_sdk/integrations/mcp.py:656: error: Item "None" of "Any | None" has no attribute "_get_prompt_mcp"  [union-attr]
sentry_sdk/integrations/mcp.py:659: error: Item "None" of "Any | None" has no attribute "_read_resource_mcp"  [union-attr]
sentry_sdk/integrations/mcp.py:673: error: Item "None" of "Any | None" has no attribute "_read_resource_mcp"  [union-attr]

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]

Codecov Results 📊

✅ 146 passed | Total: 146 | Pass Rate: 100% | Execution Time: 21.68s

📊 Comparison with Base Branch

Metric	Change
Total Tests	—
Passed Tests	—
Failed Tests	—
Skipped Tests	—

✨ No test changes detected

All tests are passing successfully.

❌ Patch coverage is 0.00%. Project has 14495 uncovered lines.
❌ Project coverage is 33.75%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
mcp.py	5.86%	⚠️ 257 Missing

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
- Coverage    34.98%    33.75%    -1.23%
==========================================
  Files          190       190         —
  Lines        21877     21880        +3
  Branches      7360      7366        +6
==========================================
+ Hits          7652      7385      -267
- Misses       14225     14495      +270
- Partials       800       743       -57

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