morph bug fix (#15370)

Two bug fixes here: 

# MorphRelationOneToManyFieldDisplay
we expect an empty array, not undefined (run time error otherwise)


Fixes `Cannot read properties of undefined (reading 'length'): Cannot
read properties of undefined (reading 'length')` in
**MorphRelationOneToManyFieldDisplay**

```js
morphValuesWithObjectNameSingular.every(
      (morphValueWithObjectNameSingular) =>
        morphValueWithObjectNameSingular.value.length === 0,
    );
```

# create record in table mode
if the record has a relation there is currenlty a bug in production when
it is created. A cache issue.

`Missing field 'companyFoundedId' while writing result `

packages/twenty-front/src/modules/object-record/utils/prefillRecord.ts

@@ -27,7 +27,7 @@ export const prefillRecord = <T extends ObjectRecord>({
           fieldMetadataItem.relation?.type === RelationType.MANY_TO_ONE
         ) {
           const joinColumnValue =
-            input[fieldMetadataItem.settings?.joinColumnName];
+            input[fieldMetadataItem.settings?.joinColumnName] ?? null;
           throwIfInputRelationDataIsInconsistent(input, fieldMetadataItem);
 
           return [