Group node fixes (#2259)

* Prevent cleaning graph state on undo/redo

* Remove pause rendering due to LG bug

* Fix crash on disconnected internal reroutes

* Fix widget inputs being incorrect order and value

* Fix initial primitive values on connect

* basic support for basic rerouted converted inputs

* Populate primitive to reroute input

* dont crash on bad primitive links

* Fix convert to group changing control value

* reduce restrictions

* fix random crash in tests

web/extensions/core/rerouteNode.js

@@ -54,6 +54,7 @@ app.registerExtension({
 						const linkId = currentNode.inputs[0].link;
 						if (linkId !== null) {
 							const link = app.graph.links[linkId];
+							if (!link) return;
 							const node = app.graph.getNodeById(link.origin_id);
 							const type = node.constructor.type;
 							if (type === "Reroute") {