Wait for data to be available before updating a feed

[rampall]

Updating a feed with a new hash is almost instantaneous. However the content served by the hash may still be syncing and not available yest on the network. This leads to 404s and broken websites atleast for a certain amount of time.

Would be practical to check if the hash's content has been full synced or is available on the network by default. And only then update a feed hash. Maybe with a force option to override this check and update feed nevertheless.

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