Add withoutChildren scope to NestedTree

[RomainMazB]

Currently building a Winter.User blogs plugin, based on Winter.Blog.
I needed to list all the available parent categories for the current one, but excluding the current category's children to avoid circular references.

I thought it would be good to add this scope to the core.

[LukeTowers]

@RomainMazB can you add a unit test for this?

[RomainMazB]

All the actual tests are included in wintercms/winter, is there where you want me to add it?

As a side note, it could be more clear to pull back almost all of this wintercms/winter test folder inside winter/storm as most of the tests are more related to storm than winter IMO

[bennothommo]

@RomainMazB

As a side note, it could be more clear to pull back almost all of this wintercms/winter test folder inside winter/storm as most of the tests are more related to storm than winter IMO

I agree with this. It's something on my list to do, but the list is loooooooong, so won't be any time soon.

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[LukeTowers]

@RomainMazB the tests have been reorganized in the Winter core now, are you able to add a test case for this? Ideally at some point we should probably be able to run database tests on this library directly but for now a PR to the wintercms/winter with the test case for this addition and perhaps an addition to the docs and we should be able to merge this.

[bennothommo]

Just to note, we can run database tests in Storm. There's a couple of them in there now - https://github.com/wintercms/storm/tree/develop/tests/Database/Traits. They just need to extend the DbTestCase base test class.

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[LukeTowers]

@RomainMazB are you still interested in getting this merged?

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