Bastian Köcher a4662104db Make collation an optional return (#1787) ...

This pr changes the collator interface function to return an optional
collation instead of a collation. This is required as the parachain
itself can fail to generate a valid collation for various reason. Now if
the collation fails it will return `None`.

Besides that the pr adds some `RuntimeDebug` derive for `ValidationData`
and removes some whitespaces.

2020-10-06 11:57:10 +02:00

polkadot

Make collation an optional return (#1787)

2020-10-06 11:57:10 +02:00

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