FIX Don't trigger init if already redirected

[lekoala]

Fixes #1829

See issue for context

Description

Manual testing steps

Issues

• ModelAdmin executes init code even when there is no authenticated user #1829

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• This change is covered with tests (or tests aren't necessary for this change)
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• CI is green

[GuySartorelli]

Code looks good to me.
I'm just running a CI run against 2.2 to double check if the CI failures are pre-existing.

[GuySartorelli]

The CI failures aren't happening without this PR. Can you please take a look and see if you can resolve them?

[lekoala]

The CI errors are a bit strange honestly

EDIT : ok I see the classes expect to have a default tab class even with an empty session, i'll fix this

I think these tests assume too much and should probably be fixed but I haven't had a deeper look at it

1) SilverStripe\Admin\Tests\ModelAdminTest::testExportFieldsDefaultIsSummaryFields
InvalidArgumentException: singleton() Called without a class

/home/runner/work/silverstripe-admin/silverstripe-admin/vendor/silverstripe/framework/src/includes/functions.php:28
/home/runner/work/silverstripe-admin/silverstripe-admin/code/ModelAdmin.php:377
/home/runner/work/silverstripe-admin/silverstripe-admin/tests/php/ModelAdminTest.php:81
/home/runner/work/silverstripe-admin/silverstripe-admin/vendor/bin/phpunit:122

2) SilverStripe\Admin\Tests\ModelAdminTest::testGetGridField
InvalidArgumentException: Call <classname>::get() instead of DataObject::get()

/home/runner/work/silverstripe-admin/silverstripe-admin/vendor/silverstripe/framework/src/ORM/DataObject.php:3320
/home/runner/work/silverstripe-admin/silverstripe-admin/code/ModelAdmin.php:401
/home/runner/work/silverstripe-admin/silverstripe-admin/code/ModelAdmin.php:2[94](https://github.com/silverstripe/silverstripe-admin/actions/runs/11013516566/job/30582087994?pr=1830#step:12:97)
/home/runner/work/silverstripe-admin/silverstripe-admin/tests/php/ModelAdminTest/OverridenModelAdmin.php:50
/home/runner/work/silverstripe-admin/silverstripe-admin/code/ModelAdmin.php:266
/home/runner/work/silverstripe-admin/silverstripe-admin/tests/php/ModelAdminTest.php:119
/home/runner/work/silverstripe-admin/silverstripe-admin/vendor/bin/phpunit:122

[lekoala]

@GuySartorelli CI is green

[GuySartorelli]

Thanks for updating so the tests pass!
It's a little less clear what's going on now though, so I've requested a change to the comment to make up for that.

[michalkleiner]

I'm not sure if the // if we've hit the "landing" page code block now makes sense in the place where it is now, after the new check.

[lekoala]

I'm not sure if the // if we've hit the "landing" page code block now makes sense in the place where it is now, after the new check.

i can update to "if we've hit the "landing" page or if the model is not valid"

i agree it still a bit odd, because you would expect and invalid model to do some kind of errors, but since the model admin class can be instantiated by itself, without a valid user (as designed in the unit tests at the moment), it should still properly return default summary fields for instance