Lev Berman 230a5b2d69 ABCI chain migration conclusion (#2488)
* Problem: No good way to check for val set absence.

Solution: Make get_validator_set/get_validators return None/[] when there are no validators yet.

* Problem: Incompatible ABCI chain upgrades.

Solution: Record known chains and sync through InitChain. Triggering the migration and adjusting other ABCI endpoints will follow.
2018-09-03 15:41:49 +02:00
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