Fix: Avoid NPE when MDC contains null values

[wreulicke]

📜 Description

Avoid NPE when MDC contains null values
Follow up #1364

💡 Motivation and Context

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code
• I added tests to verify the changes
• I updated the docs if needed
• No breaking changes

🔮 Next steps

[marandaneto]

@wreulicke why is it a follow-up of #1364 ? doesn't #1364 fix the issue at all?

[wreulicke]

@marandaneto
To be exact, This fixes the issues similar to #1364.
follow up might not be accurate.

[marandaneto]

@marandaneto
To be exact, This fixes the issues similar to #1364.
follow up might not be accurate.

I just noticed its pretty much the same fix but for sentry-jul, that was the issue, I thought you were just fixing the same issue for sentry-logback :)

mind writing a unit test? thanks

[codecov-io]

Codecov Report

Merging #1385 (cbe4ae4) into main (142dd44) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main    #1385      +/-   ##
============================================
+ Coverage     75.68%   75.72%   +0.03%     
- Complexity     1858     1861       +3     
============================================
  Files           185      185              
  Lines          6363     6368       +5     
  Branches        636      637       +1     
============================================
+ Hits           4816     4822       +6     
  Misses         1258     1258              
+ Partials        289      288       -1     

Impacted Files	Coverage Δ	Complexity Δ
...jul/src/main/java/io/sentry/jul/SentryHandler.java	75.00% <100.00%> (+1.89%)	34.00 <2.00> (+3.00)

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[wreulicke]

@marandaneto

I have written the unit test.
Could you check this PR?

[marandaneto]

LGTM

[marandaneto]

@marandaneto

I have written the unit test.
Could you check this PR?

all good, thanks for the contribution @wreulicke