Fail in test('add preloaded hasOne relationship to toObject result') when setRelated with null

[haohanzhou123]

Package version

18.2.0

Node.js and npm version

Node.js 16.14.0 npm 8.3.1

Sample Code (to reproduce the issue)

modify test/orm/base-model.spec.ts to reproduce

test.group('Base Model | toObject'，(group) => {
  test('add preloaded hasOne relationship to toObject result', async ({ assert }) => {
    class Profile extends BaseModel {
      @column()
      public username: string

      @column()
      public userId: number
    }

    class User extends BaseModel {
      @column({ isPrimary: true })
      public id: number

      @column()
      public username: string

      @hasOne(() => Profile)
      public profile: HasOne<typeof Profile>
    }

    const user = new User()
    user.username = 'virk'
    user.$setRelated('profile', null)      // set the related null
    user.toObject()
  })
})

throw ERR:

 Cannot read properties of null (reading 'toObject')
 at anonymous src/Orm/BaseModel/index.ts:1930

With commit: fix: set belongsTo and hasOne relationship property to null or model instance introduced in v14.0.0, this.setRelated(parentModel, match || null) makes it possible that relationship can be set to null explicitly.

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