Fix rendering

Author: SchrodingersGat

src/frontend/src/components/render/Part.tsx

@@ -60,6 +60,10 @@ export function RenderPartCategory(
 ): ReactNode {
   const { instance } = props;
 
+  if (!instance) {
+    return '';
+  }
+
   const suffix: ReactNode = (
     <Group gap='xs'>
       <TableHoverCard

src/frontend/src/components/render/Stock.tsx

@@ -22,6 +22,10 @@ export function RenderStockLocation(
 ): ReactNode {
   const { instance } = props;
 
+  if (!instance) {
+    return '';
+  }
+
   const suffix: ReactNode = (
     <Group gap='xs'>
       <TableHoverCard

src/frontend/tests/pages/pui_stock.spec.ts

@@ -323,6 +323,7 @@ test('Stock - Return Items', async ({ browser }) => {
       name: 'action-menu-stock-operations-return-stock'
     })
     .click();
+
   await page.getByText('#128').waitFor();
   await page.getByText('Merge into existing stock').waitFor();
   await page.getByRole('textbox', { name: 'number-field-quantity' }).fill('0');