do not set frames if there's none

[marandaneto]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

do not set frames if there's none.

💡 Motivation and Context

fix #233

💚 How did you test it?

unit test.

📝 Checklist

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

🔮 Next steps

[codecov-io]

Codecov Report

Merging #234 into master will increase coverage by 0.06%.
The diff coverage is 92.85%.

@@             Coverage Diff              @@
##             master     #234      +/-   ##
============================================
+ Coverage     58.76%   58.82%   +0.06%     
- Complexity      569      572       +3     
============================================
  Files            72       72              
  Lines          2653     2657       +4     
  Branches        235      236       +1     
============================================
+ Hits           1559     1563       +4     
  Misses          979      979              
  Partials        115      115

Impacted Files	Coverage Δ	Complexity Δ
...n/java/io/sentry/core/SentryStackTraceFactory.java	90.9% <100%> (+0.28%)	13 <5> (+1)	⬆️
...in/java/io/sentry/core/SentryExceptionFactory.java	92.68% <88.88%> (ø)	8 <6> (ø)	⬇️
.../main/java/io/sentry/core/SentryThreadFactory.java	96.29% <92.85%> (-3.71%)	9 <8> (+1)
...c/main/java/io/sentry/core/DirectoryProcessor.java	80% <0%> (+4%)	7% <0%> (+1%)	⬆️

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