iotaledger / iota / 19751538162

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fix(consensus): return last own block with None if transactions are missing (#9440)

# Description of change

Fix recovery logic for Starfish to safely handle cases where a node's
own non-genesis block may not be available in the DAG State after
restart. Instead of panicking when transactions are missing, the
recovery process now gracefully returns None and continues.

## Links to any relevant issues

Fixes #9439

## How the change has been tested

- [x] Basic tests (linting, compilation, formatting, unit/integration
tests)
- [ ] Patch-specific tests (correctness, functionality coverage)
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] I have checked that new and existing unit tests pass locally with
my changes

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