Fix: NPE when adding Context Data with null values for log4j2

[maciejwalkowiak]

📜 Description

Fix: Fix NPE when adding Context Data with null values for log4j2

💡 Motivation and Context

Fixes #1386

💚 How did you test it?

📝 Checklist

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

[codecov-commenter]

Codecov Report

Merging #1465 (d4a013b) into main (ada5080) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main    #1465      +/-   ##
============================================
+ Coverage     75.83%   75.85%   +0.01%     
- Complexity     1901     1906       +5     
============================================
  Files           189      189              
  Lines          6502     6506       +4     
  Branches        640      642       +2     
============================================
+ Hits           4931     4935       +4     
  Misses         1275     1275              
  Partials        296      296              

Impacted Files	Coverage Δ	Complexity Δ
...jul/src/main/java/io/sentry/jul/SentryHandler.java	74.59% <100.00%> (-0.41%)	34.00 <2.00> (ø)
...src/main/java/io/sentry/log4j2/SentryAppender.java	84.81% <100.00%> (+0.19%)	21.00 <2.00> (+2.00)
...rc/main/java/io/sentry/logback/SentryAppender.java	89.87% <100.00%> (-0.13%)	25.00 <2.00> (ø)
.../src/main/java/io/sentry/util/CollectionUtils.java	62.50% <100.00%> (+22.50%)	6.00 <3.00> (+3.00)

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[marandaneto]

LGTM