fix(crud): don't fallback to zero if the count cannot be determined (#6557)

don't fallback to zero if the count cannot be determined

Author: lerouxb

packages/compass-crud/src/stores/crud-store.ts

@@ -1896,7 +1896,7 @@ class CrudStoreImpl
         affected !== 1 ? 's' : ''
       }`,
       description: `This action can not be undone. This will permanently delete ${
-        affected || 0
+        affected ?? 'an unknown number of'
       } document${affected !== 1 ? 's' : ''}.`,
       variant: 'danger',
     });