if retry after header has empty categories, apply retry after to all of them

[marandaneto]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

if retry after header has empty categories, apply retry after to all of them.

💡 Motivation and Context

the current implementation was not handling empty categories.

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• All tests passing

🔮 Next steps

[codecov-io]

Codecov Report

Merging #377 into master will decrease coverage by 0.04%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master     #377      +/-   ##
============================================
- Coverage     59.24%   59.20%   -0.05%     
- Complexity      767      768       +1     
============================================
  Files            87       87              
  Lines          3548     3554       +6     
  Branches        343      345       +2     
============================================
+ Hits           2102     2104       +2     
- Misses         1295     1297       +2     
- Partials        151      153       +2     

Impacted Files	Coverage Δ	Complexity Δ
...n/java/io/sentry/core/transport/HttpTransport.java	66.45% <50.00%> (-1.29%)	20.00 <0.00> (+1.00)	⬇️

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