fix: Fix crash when last replay info is missing some keys

[itaybre]

Fixes crash when last replay info is missing some keys

Closes #6580

[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.083%. Comparing base (41834f1) to head (2aa17a2).
⚠️ Report is 1 commits behind head on v8.x.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
Sources/Sentry/SentrySessionReplayIntegration.m	62.500%	6 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##              v8.x     #6577       +/-   ##
=============================================
+ Coverage   85.676%   86.083%   +0.406%     
=============================================
  Files          441       441               
  Lines        27417     27442       +25     
  Branches     10357     11916     +1559     
=============================================
+ Hits         23490     23623      +133     
+ Misses        3886      3773      -113     
- Partials        41        46        +5     

Files with missing lines	Coverage Δ
Sources/Sentry/SentrySessionReplayIntegration.m	86.067% <62.500%> (-1.000%)	⬇️

... and 17 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 41834f1...2aa17a2. Read the comment docs.

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1234.55 ms	1262.58 ms	28.03 ms
Size	23.75 KiB	992.02 KiB	968.28 KiB

Baseline results on branch: v8.x

Startup times

Revision	Plain	With Sentry	Diff
f76f6bf	1207.70 ms	1233.27 ms	25.57 ms
c11a8e0	1203.00 ms	1223.23 ms	20.23 ms
ab82dac	1249.73 ms	1272.69 ms	22.96 ms
41834f1	1235.15 ms	1256.31 ms	21.17 ms
a7a0a2b	1218.61 ms	1248.69 ms	30.08 ms
ab82dac	1213.12 ms	1240.92 ms	27.80 ms
b66be9b	1218.22 ms	1244.19 ms	25.96 ms
c6afcc7	1224.31 ms	1256.22 ms	31.92 ms
5e3fb04	1239.84 ms	1267.39 ms	27.55 ms
3af1ae9	1225.60 ms	1252.65 ms	27.05 ms

App size

Revision	Plain	With Sentry	Diff
f76f6bf	23.74 KiB	981.30 KiB	957.56 KiB
c11a8e0	23.75 KiB	991.86 KiB	968.12 KiB
ab82dac	23.75 KiB	991.85 KiB	968.10 KiB
41834f1	23.75 KiB	991.88 KiB	968.13 KiB
a7a0a2b	23.75 KiB	996.04 KiB	972.29 KiB
ab82dac	23.75 KiB	991.86 KiB	968.11 KiB
b66be9b	23.75 KiB	996.03 KiB	972.28 KiB
c6afcc7	23.75 KiB	996.03 KiB	972.28 KiB
5e3fb04	23.74 KiB	981.30 KiB	957.56 KiB
3af1ae9	23.74 KiB	981.29 KiB	957.55 KiB

Previous results on branch: itay/fix_replay_crash

Startup times

Revision	Plain	With Sentry	Diff
478c2a4	1233.88 ms	1261.29 ms	27.41 ms

App size

Revision	Plain	With Sentry	Diff
478c2a4	23.75 KiB	992.03 KiB	968.28 KiB

[philprime]

LGTM, thank you