Add a check in idb.DecodeTxnRowNext() to prevent indexer crash

[tolikzinovyev]

No description provided.

[codecov-commenter]

Codecov Report

Merging #796 (c02dc0f) into develop (da24444) will decrease coverage by 0.03%.
The diff coverage is 57.14%.

@@             Coverage Diff             @@
##           develop     #796      +/-   ##
===========================================
- Coverage    58.77%   58.73%   -0.04%     
===========================================
  Files           29       29              
  Lines         3985     3986       +1     
===========================================
- Hits          2342     2341       -1     
- Misses        1348     1349       +1     
- Partials       295      296       +1     

Impacted Files	Coverage Δ
idb/idb.go	54.16% <57.14%> (-3.29%)	⬇️

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