Refreshing (button on menu) crashes if a number primitive is on the graph

Add a KSampler
Convert seed to input
Connect primitive to it
Refresh via R or the button on the menu

```
Uncaught (in promise) TypeError: def is undefined
refreshComboInNodes http://127.0.0.1:8188/scripts/app.js:1259
onclick http://127.0.0.1:8188/scripts/ui.js:583
keybindListener http://127.0.0.1:8188/extensions/core/keybinds.js:70
init http://127.0.0.1:8188/extensions/core/keybinds.js:74
invokeExtensionsAsync http://127.0.0.1:8188/scripts/app.js:88
#invokeExtensionsAsync http://127.0.0.1:8188/scripts/app.js:85
setup http://127.0.0.1:8188/scripts/app.js:851
async* http://127.0.0.1:8188/:12
```
Looks like its trying to refresh the control_after_generate combo
Should just ignore combos that don't exist in the node definition