Handle transaction hash nil case

[AnkushinDaniil]

Added checks for nil Transaction and nil TransactionHash in the genTransactions method. If either is nil, a warning is logged, and the loop is broken to prevent further processing of invalid transactions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.41%. Comparing base (874e86c) to head (78e5bd4).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2292      +/-   ##
==========================================
- Coverage   75.45%   75.41%   -0.05%     
==========================================
  Files         107      107              
  Lines       11404    11404              
==========================================
- Hits         8605     8600       -5     
- Misses       2147     2151       +4     
- Partials      652      653       +1     

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