Harden masternode handling to avoid empty validator sets#4

Copilot wants to merge 3 commits into

v0/deejae69-2866302dDeejae69/nethermind:v0/deejae69-2866302dfrom

copilot/improve-master-functionalityDeejae69/nethermind:copilot/improve-master-functionalityCopy head branch name to clipboard