always check node group

src/components/inspector.tsx

@@ -765,7 +765,7 @@ const NodeInspector: FC = () => {
             rules={[
               {
                 validator() {
-                  if (def.group && usingGroups && !usingGroups[def.group]) {
+                  if (def.group && !usingGroups[def.group]) {
                     return Promise.reject(new Error(t("node.invalidGroup", { group: def.group })));
                   }
                   return Promise.resolve();

src/components/register-node.ts

@@ -150,7 +150,7 @@ G6.registerNode(
         !nodeDefs.has(data.name) ||
         (data.path && !data.children?.length) ||
         !checkTreeData(data) ||
-        (nodeDef.group && usingGroups && !usingGroups[nodeDef.group]) ||
+        (nodeDef.group && !usingGroups[nodeDef.group]) ||
         (usingVars && data.input?.some((v) => !usingVars![v])) ||
         (usingVars && data.output?.some((v) => !usingVars![v])) ||
         (usingVars &&