Seth Hillbrand e0f7c3b057 Properly handle non-connected labels in ERC
All labels need to be attached to a net that has at least 2 pins in
order for this to be a valid net.  To check for the existing pins, we
need to interate over all subgraphs in the net, counting pins
2022-09-19 15:18:32 -07:00
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