Null exported for storage

[rekt-hard]

Describe the bug When exporting, null is exported in the template. This concerns all three templates.

Is this a regression? No.

Steps to Reproduce

1. Login as an admin
2. Go to admin panel
3. Create a storage and for the translation, only enter a title and select a language
4. Create a DMP
5. Specify a new dataset
6. Go to step 5
7. Click on the Storage tab
8. Select the previously created storage
9. Select the previously defined dataste
10. Export with any template
11. Open the exported document
12. Find the section about the storage

Expected behavior null should not be exported. Depending on what the real value should be, either an empty string or a default value may be exported.

Screenshots

Environment

• Damap version 4.2.2

Additional context