Error displaying connection

[Seanny123]

Steps to reproduce:

1. Use the model code:

import nengo

model = nengo.Network()

with model:
    ens = nengo.Ensemble(100, 1)
    
    with nengo.Network() as net:
        wat = nengo.Ensemble(100, 1)
        nengo.Connection(wat, ens)

2. Expand the network net.

3. You should get an error like:

error processing <Connection from <Ensemble (unlabeled) at 0x7f9ab0a1b320> to <Ensemble (unlabeled) at 0x7f9ab2f484e0>>