Add empty context menu (#8519)

* Add empty context menu

- For tables without "row actions"
- Show an "empty" menu
- For UX consistency across all tables

* Fix for playwright tests

- Recent changes to the demo dataset...

* Fix typo

src/frontend/src/tables/InvenTreeTable.tsx

@@ -590,6 +590,8 @@ export function InvenTreeTable<T extends Record<string, any>>({
         disabled: action.disabled
       }));
       return showContextMenu(items)(event);
+    } else {
+      return showContextMenu([])(event);
     }
   };
 

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

@@ -112,7 +112,7 @@ test('Parts - Allocations', async ({ page }) => {
 
   // Check that the overall allocations are displayed correctly
   await page.getByText('11 / 825').waitFor();
-  await page.getByText('6 / 110').waitFor();
+  await page.getByText('5 / 109').waitFor();
 
   // Navigate to the "Allocations" tab
   await page.getByRole('tab', { name: 'Allocations' }).click();