Fix Side Panel v2 bugs (#10865)

Fixing:
- Export as PDF on empty note
- Command O (sub commands) not using the right contextStore
- BelongsToOne Field input triggering an error on open if no existing
relation record is pre-selected

packages/twenty-front/src/modules/object-record/object-options-dropdown/components/ObjectOptionsDropdownRecordGroupFieldsContent.tsx

@@ -140,7 +140,7 @@ export const ObjectOptionsDropdownRecordGroupFieldsContent = () => {
         ))}
       </DropdownMenuItemsContainer>
       <DropdownMenuSeparator />
-      <DropdownMenuItemsContainer>
+      <DropdownMenuItemsContainer scrollable={false}>
         <UndecoratedLink
           to={newSelectFieldSettingsUrl}
           onClick={() => {

packages/twenty-front/src/modules/object-record/record-show/record-detail-section/components/RecordDetailRelationSection.tsx

@@ -197,7 +197,9 @@ export const RecordDetailRelationSection = ({
   const handleOpenRelationPickerDropdown = () => {
     if (isToOneObject) {
       setSingleRecordPickerSearchFilter('');
-      setSingleRecordPickerSelectedId(relationRecords[0].id);
+      if (relationRecords.length > 0) {
+        setSingleRecordPickerSelectedId(relationRecords[0].id);
+      }
     }
 
     if (isToManyObjects) {