fix: add null check for type_i field in OperationDeserializer

[overcat]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.03%. Comparing base (87ea58c) to head (acc2daa).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...llar/sdk/responses/gson/OperationDeserializer.java	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #755      +/-   ##
============================================
+ Coverage     81.01%   81.03%   +0.01%     
- Complexity     1398     1400       +2     
============================================
  Files           216      216              
  Lines          5374     5377       +3     
  Branches        528      529       +1     
============================================
+ Hits           4354     4357       +3     
+ Misses          718      717       -1     
- Partials        302      303       +1     

Files with missing lines	Coverage Δ
...llar/sdk/responses/gson/OperationDeserializer.java	90.24% <66.66%> (+0.77%)	⬆️

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