Group Title validation isn't being tested

[GuySartorelli]

Affected Version: 4.10.0, 4.10.1

Description

In #10113 there was some validation added to disallow empty titles via the CMS form, but no behat test was added.
It seems likely the thinking for adding it as form validation was to avoid breaking changes if it was added to validate() directly - but there is no unit test to validate that an empty title can be given to a group programmatically.

Acceptance Critera

• Add behat test to ensure that blank title throws validation warning in UI
• Add unit test to ensure that blank Title is allowed when group is created programmatically

PRs

• MNT Add test for programatically adding blank Group title. #10355
• MNT Add new behat test for Group title validation silverstripe-admin#1310

[GuySartorelli]

PRs were merged