Robert Habermeier 6b166a7a1f fix approval-checking GRANDPA voting rule (#3133)
* fix approval-checking GRANDPA voting rule

a `None` return value implies to vote on the best, not to vote on the base.

this explicitly changes the logic to vote on the base

* refactor logic out and test
2021-05-31 10:45:16 -05:00
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