Bugfix: don't crash on re-org of header-only chain #1810
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What was wrong?
When a chain reorg's, it tries to remove the canonical transactions from the lookup db. If that chain is header-only, it crashes, because the canonical transactions were never inserted.
How was it fixed?
Catch and drop the exception if canonical transactions were missing. The point was to delete them, so if they are missing: mission accomplished.
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