Issue validating multilingual records from the contribute tab in GeoNetwork 4.2

**Describe the bug**
When validating a multilingual record from the contribute tab, there are numerous validation errors:
`The 'gmd:LocalisedCharacterString' element has no child elements.`
This can be seen in ISO19139 with the multilingual template record. Validating a record individually from its edit view does not trigger the same errors.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'metadata and templates' and load the template records for ISO19139
2. In the contribute tab select the `Template for Vector data in ISO19139 (multilingual)` record
3. Validate it
4. See the errors in the validation report

**Expected behavior**
Validation from the contribute tab should not trigger these errors

Start by reproducing the validation from the contribute tab using the ISO19139 multilingual template record, then compare its validation report with validation from the record's edit view. Trace the two validation entry points and identify why only the contribute-tab path reports LocalisedCharacterString errors. Done means both paths validate the record without these errors.

Written by the indexing model from the issue text.