Content Migrations: sections and single page error on migrate/up with blank uriFormat

[skramstad]

Description

When running ./craft migrate/up with this code and uriFormat is blank for homepage. It fails to run the migration. Setting null does not work either. However if I set something random in the uriFormat field it works.

Is this a bug or am I missing something?

Thanks!

Error message below:

   *** failed to apply m180304_095011_entry_homepage (time: 0.021s)
   0 from 1 migrations were applied.
  Migration failed. The rest of the migrations are canceled.

Migration:

    // Get the primary site ID
    $siteId = Craft::$app->sites->getPrimarySite()->id;

    //
    // Create Home
    //
    $homepage = new Section([
        'name' => 'Home',
        'handle' => 'homepage',
        'enableVersioning' => 1,
        'type' => 'single',
        'siteSettings' => [
            new Section_SiteSettings([
                'siteId' => $siteId,
                'uriFormat' => '',
                'template' => 'index',
                'hasUrls' => 1,
            ])
        ]
    ]);

    return Craft::$app->sections->saveSection($homepage);

Steps to reproduce

1. Create a new migration with migrate/create
2. Insert this code
3. ./craft migrate/up

Additional info

• Craft version: Craft Pro 3.0.0-RC13
• PHP version: 7.0.25
• Database driver & version: MySQL 5.7.21

[brandonkelly]

If you want the single to be the homepage, you must set its uriFormat to __home__.