Summary of Changes

When creating a new custom field of the type repeatable and the fieldname is left empty, the values are not stored. This changed makes the fieldname required thus making sure the values can be stored.

Testing Instructions

1. Setup a Joomla 3.9 installation
2. Go to Content Fields
3. Create a new field by clicking New
4. Enter the Title Repeatable
5. Select the type repeatable
6. Add a new Form Field by clicking on the green +
7. Leave the Name empty
8. Set the Type to Text
9. The form now looks like this:
   
10. Save & Close the field
11. Click on Articles
12. Click on New
13. Enter the article title
14. Click on the Fields tab
15. There is the repeatable field we just created
16. Click on the green + to add a value
17. Enter a value
18. Click on the green + again
19. Enter a second value
20. Save the article
21. Notice the two rows are there but there are no values
22. Apply the patch
23. Go to Content -> Fields
24. Edit the Repeatable field we created in step 10
25. Notice that the Name field is now required
26. Enter a name
27. Save & Close the field
28. Repeat step 11 until 19
29. Notice the two rows are there with values this time.

Expected result

Values are stored and shown

Actual result

Values are not stored and not shown

Documentation Changes Required

None