Autorouter unexpectedly failing on simple design.
```
Uncaught TypeError: Cannot read property 'id' of null
at i (editorPCB.min.js:34)
at Object.a [as importSession] (editorPCB.min.js:34)
at importSession (editorPCB.min.js:34)
at n (editorPCB.min.js:2)
at Za (main.min.js:9)
at i.m.onResult (main.min.js:17)
at WebSocket.o.onmessage (main.min.js:17)
```
```
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36"
```
uploaded pcb to:
```
https://oshwlab.com/qcrist/broken-autorouter
```
