fix: gracefully handle missing object metadata in useObjectNameSingularFromPlural

https://sonarly.com/issue/17092?type=bug

When a user navigates to `/objects/quotes` (a custom object that doesn't exist in their workspace metadata), `useObjectNameSingularFromPlural` throws an unhandled error before the redirect to `/not-found` takes effect, causing a React render crash.

packages/twenty-front/src/modules/object-metadata/hooks/useObjectNameSingularFromPlural.ts

@@ -1,12 +1,11 @@
 import { objectMetadataItemFamilySelector } from '@/object-metadata/states/objectMetadataItemFamilySelector';
 import { useAtomFamilySelectorValue } from '@/ui/utilities/state/jotai/hooks/useAtomFamilySelectorValue';
-import { isDefined } from 'twenty-shared/utils';
 
 export const useObjectNameSingularFromPlural = ({
   objectNamePlural,
 }: {
   objectNamePlural: string;
-}) => {
+}): { objectNameSingular: string | undefined } => {
   const objectMetadataItem = useAtomFamilySelectorValue(
     objectMetadataItemFamilySelector,
     {
@@ -15,11 +14,5 @@ export const useObjectNameSingularFromPlural = ({
     },
   );
 
-  if (!isDefined(objectMetadataItem)) {
-    throw new Error(
-      `Object metadata item not found for ${objectNamePlural} object`,
-    );
-  }
-
-  return { objectNameSingular: objectMetadataItem.nameSingular };
+  return { objectNameSingular: objectMetadataItem?.nameSingular };
 };