fix: Crash in setMeasurement when name is nil

[philipphofmann]

📜 Description

Although the name for setMeasurement is nonnull, we saw occurrences when it was nil, which led to crashes. Now, when the name is nil, the SDK discards the measurement and logs an error.

💡 Motivation and Context

A customer reported these crashes.

💚 How did you test it?

Unit tests

📝 Checklist

You have to check all boxes before merging:

• 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.
• I updated the wizard 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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.729%. Comparing base (9c3c8d5) to head (797eb72).
Report is 2 commits behind head on main.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #5064       +/-   ##
=============================================
- Coverage   92.731%   92.729%   -0.002%     
=============================================
  Files          674       675        +1     
  Lines        83552     83629       +77     
  Branches     30451     30480       +29     
=============================================
+ Hits         77479     77549       +70     
- Misses        5976      5980        +4     
- Partials        97       100        +3     

Files with missing lines	Coverage Δ
Sources/Sentry/SentryTracer.m	97.631% <100.000%> (+0.036%)	⬆️
Tests/SentryTests/Transaction/SentryTracer+Test.m	100.000% <100.000%> (ø)
...ts/SentryTests/Transaction/SentryTracerTests.swift	99.418% <100.000%> (+0.024%)	⬆️

... and 11 files with indirect coverage changes

---

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[philprime]

LGTM, left some comments

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1223.76 ms	1254.88 ms	31.12 ms
Size	22.30 KiB	846.07 KiB	823.77 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
6164c67	1219.02 ms	1231.38 ms	12.35 ms
596ccc1	1230.85 ms	1244.24 ms	13.39 ms
253bb71	1221.62 ms	1250.82 ms	29.20 ms
c59914b	1342.08 ms	1375.73 ms	33.65 ms
ebfe678	1234.63 ms	1254.52 ms	19.89 ms
9ce54cc	1230.31 ms	1237.20 ms	6.90 ms
0a12181	1231.37 ms	1248.13 ms	16.75 ms
7bbb7c3	1232.40 ms	1249.78 ms	17.38 ms
3cba0e8	1243.04 ms	1257.46 ms	14.42 ms
c0ea6a1	1236.42 ms	1250.94 ms	14.52 ms

App size

Revision	Plain	With Sentry	Diff
6164c67	21.58 KiB	681.72 KiB	660.14 KiB
596ccc1	22.84 KiB	401.44 KiB	378.60 KiB
253bb71	20.76 KiB	393.37 KiB	372.60 KiB
c59914b	21.58 KiB	671.90 KiB	650.32 KiB
ebfe678	22.31 KiB	775.27 KiB	752.95 KiB
9ce54cc	21.58 KiB	573.71 KiB	552.13 KiB
0a12181	21.58 KiB	419.20 KiB	397.61 KiB
7bbb7c3	21.58 KiB	418.78 KiB	397.20 KiB
3cba0e8	22.84 KiB	403.19 KiB	380.34 KiB
c0ea6a1	21.58 KiB	671.94 KiB	650.35 KiB

Previous results on branch: fix/set-measurement-crash

Startup times

Revision	Plain	With Sentry	Diff
9bc0dc1	1221.45 ms	1238.69 ms	17.24 ms
097f0f6	1211.33 ms	1238.49 ms	27.16 ms

App size

Revision	Plain	With Sentry	Diff
9bc0dc1	22.30 KiB	844.67 KiB	822.37 KiB
097f0f6	22.30 KiB	846.07 KiB	823.77 KiB

[philipphofmann]

Sorry about the commit messup, I accidentially merged #5067 into this one before merging this PR.