Gracefully handle tx with incomplete cairo0 class

[kirugan]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 75.38%. Comparing base (d2031ca) to head (3267e9d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
rpc/class.go	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2286      +/-   ##
==========================================
+ Coverage   75.23%   75.38%   +0.15%     
==========================================
  Files         107      107              
  Lines       11398    11404       +6     
==========================================
+ Hits         8575     8597      +22     
+ Misses       2172     2153      -19     
- Partials      651      654       +3     

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