impr: Skip enriching scope when nil

[philipphofmann]

📜 Description

Skip enriching the scope in the hub initializer when it is nil, as enrich scope expects a non nil scope.

💡 Motivation and Context

This came up while investigating flaky tests.

💚 How did you test it?

Unit tests.

📝 Checklist

You have to check all boxes before merging:

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.480%. Comparing base (2911760) to head (8af0bf6).

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #4243       +/-   ##
=============================================
+ Coverage   91.473%   91.480%   +0.006%     
=============================================
  Files          612       612               
  Lines        49341     49355       +14     
  Branches     17843     17848        +5     
=============================================
+ Hits         45134     45150       +16     
+ Misses        4115      4112        -3     
- Partials        92        93        +1     

Files	Coverage Δ
Sources/Sentry/SentryHub.m	98.655% <100.000%> (+0.003%)	⬆️
Sources/Swift/Tools/UIRedactBuilder.swift	99.056% <100.000%> (ø)
...s/SentryTests/SentryCrash/TestSentryCrashWrapper.m	80.000% <100.000%> (+2.222%)	⬆️
Tests/SentryTests/SentryHubTests.swift	98.901% <100.000%> (+0.013%)	⬆️

... and 5 files with indirect coverage changes

---

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1238.76 ms	1261.38 ms	22.62 ms
Size	21.58 KiB	697.84 KiB	676.25 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
6bc31df	1202.52 ms	1215.86 ms	13.34 ms
6ad07ae	1240.76 ms	1242.98 ms	2.22 ms
8cd6cfa	1229.88 ms	1251.45 ms	21.57 ms
effc81c	1253.71 ms	1256.16 ms	2.45 ms
e70a2e1	1207.54 ms	1227.17 ms	19.63 ms
efb0147	1242.00 ms	1257.31 ms	15.31 ms
fb53d97	1235.00 ms	1241.88 ms	6.88 ms
881a955	1221.63 ms	1243.38 ms	21.75 ms
48e8c2e	1231.00 ms	1244.52 ms	13.52 ms
e84bc3f	1257.08 ms	1267.41 ms	10.33 ms

App size

Revision	Plain	With Sentry	Diff
6bc31df	21.58 KiB	544.86 KiB	523.28 KiB
6ad07ae	20.76 KiB	424.69 KiB	403.93 KiB
8cd6cfa	21.58 KiB	571.85 KiB	550.26 KiB
effc81c	20.76 KiB	433.18 KiB	412.42 KiB
e70a2e1	21.58 KiB	655.73 KiB	634.15 KiB
efb0147	22.84 KiB	403.52 KiB	380.67 KiB
fb53d97	20.76 KiB	425.80 KiB	405.04 KiB
881a955	22.85 KiB	407.63 KiB	384.78 KiB
48e8c2e	21.58 KiB	418.44 KiB	396.86 KiB
e84bc3f	20.76 KiB	434.72 KiB	413.96 KiB