Support minimumPeriod of 0

[bkchr]

With the switch to async backing, parachains will set a minimumPeriod of 0. (Not all, but some).

This currently breaks transaction signing here:

api/packages/api-derive/src/tx/signingInfo.ts

Line 88 in 8dbc373

api.consts.timestamp?.minimumPeriod.muln(2) ||

We should check that if minimumPeriod is 0 and then just also use the fallback duration. On top of that we should use SlotDuration from Aura: paritytech/polkadot-sdk#3732 as we use ExpectedBlockTime from Babe.

[bkchr]

@TarikGul could we get a quick fix for this?

[TarikGul]

Just woke up :), @pepoviola - Thanks for the PR. Going to check it all right now!

[TarikGul]

rel: polkadot-js/apps#9970

[TarikGul]

Once #5827 goes in we will do a patch release.

[TarikGul]

Released in 10.12.3

[polkadot-js-bot]

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