[1.2.1] P2P: Do not disconnect on catchup sync when block not available #1663
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When syncing due to a head catchup the node determines the end sync block. Therefore, if any block is not available during a head catchup sync it must be due to a fork-switch. Treat a block not found during a head catchup sync the same as a block nack sync when not found; do not disconnect.
Resolves #1660