fix(sync-v2): Fix unhandled case caused by reorg during sync of blocks

[msbrogli]

Motivation

This unhandled case was causing some tests to flaky with and IndexError.

As an example, run pytest tests/simulation/test_simulator_itself.py::SyncBridgeSimulatorSelfTestCase::test_determinism_interleaved -v -n0 with seed_config = 2519514082398162723.

Acceptance Criteria

1. Handle the case where it was expected information about one block but an empty response was sent.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (05f7228) 84.59% compared to head (deaaaf6) 84.60%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #827   +/-   ##
=======================================
  Coverage   84.59%   84.60%           
=======================================
  Files         269      269           
  Lines       22296    22278   -18     
  Branches     3401     3402    +1     
=======================================
- Hits        18861    18848   -13     
+ Misses       2765     2761    -4     
+ Partials      670      669    -1     

Files	Coverage Δ
hathor/transaction/token_creation_tx.py	99.15% <100.00%> (-0.13%)	⬇️
hathor/transaction/transaction.py	94.92% <100.00%> (+1.25%)	⬆️
...erification/token_creation_transaction_verifier.py	100.00% <100.00%> (ø)
hathor/p2p/sync_v2/agent.py	74.41% <50.00%> (-0.99%)	⬇️
hathor/verification/transaction_verifier.py	91.89% <91.07%> (-1.99%)	⬇️

... and 3 files with indirect coverage changes

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