Deleting first Group and Organization custom field is not possible

[gocemitevski]

CKAN Version if known (or site URL)

2.6+

• https://demo.ckan.org/organization/edit/20171207_mk
• https://demo.ckan.org/group/edit/16848646846
• https://beta.ckan.org/organization/edit/avg-data
• https://beta.ckan.org/group/edit/anotheraillysgroup

Please describe the expected behaviour

Each Group or Organization custom field marked for deletion should be deleted once the Update button is clicked. The deletion button should be displayed as a red button with an icon.

Please describe the actual behaviour

Whey you try to delete the first Group or Organization custom field, it only gets deleted when there are at least two custom fields set. When you try to delete the first custom field, when it's the only one in the group with paired values added, it does not get deleted once the Update button is clicked.

Also the delete icon is not rendered in < 2.8 and it's displayed as a simple checkbox.

What steps can be taken to reproduce the issue?

Navigate to any of the links above and mark the first custom field for deletion, then click Update. The field will not be deleted. Then add values to at least two custom fields, Update and mark the first one for deletion. When you click on Update again, it will be deleted.

Also, note that the delete icon is not rendered and only a simple checkbox is shown for marking.

The custom fields functionality is fully working for datasets, so please check the Manage dataset page for reference.

[Engerrs]

I confirm that this deletion issue exists and I've created a fix for that, PR to master is added.
Tested on CKAN 2.6.4 and master branch for Orgs and Groups.
Hi @tino097 , I heard that you are working on Orgs controller updates for new release, so you might need this fix to be added to your updates.
Can this be backported to CKAN 2.6 and CKAN 2.5, thanks.

[Engerrs]

Also I want to mention, that first two links added at the description are throwing Eternal Server Error, when I'm trying to open them (authorized user and anonymous), but they should throw at least 403 Forbidden:
https://demo.ckan.org/organization/edit/20171207_mk
https://demo.ckan.org/group/edit/16848646846