Show object widget values as string on missing nodes (#3294)

Co-authored-by: github-actions <github-actions@github.com>

browser_tests/assets/missing_nodes_converted_widget.json

@@ -51,7 +51,10 @@
         0.85,
         false,
         false,
-        ""
+        "",
+        {
+          "foo": "bar"
+        }
       ]
     }
   ],

src/scripts/errorNodeWidgets.ts

@@ -29,7 +29,12 @@ function addWidgetFromValue(node: LGraphNode, value: unknown) {
       name: 'UNKNOWN'
     })
   } else {
-    console.warn(`Unknown value type: ${typeof value}`)
+    widget = StringWidget(node, {
+      type: 'STRING',
+      name: 'UNKNOWN',
+      multiline: true
+    })
+    widget.value = JSON.stringify(value)
     return
   }