Fix ReferenceField does not work offline

## Problem

ReferenceField hides the (stale) data when the network returns an error. This is not the default behavior of TanStack Query, and this means that ReferenceField will always render empty in offline.

## Solution

If the query returns data, even in case of error, return it.

Author: fzaninotto

packages/ra-core/src/controller/useReference.ts

@@ -85,7 +85,7 @@ export const useReference = <
         otherQueryOptions
     );
     return {
-        referenceRecord: error ? undefined : data ? data[0] : undefined,
+        referenceRecord: data ? data[0] : undefined,
         refetch,
         error,
         isLoading,