More Reliable "Add to Account" for Marketplace Items

Adding a scene, model, or style from the Marketplace to your account now works on brand-new accounts, without an error.

Adding a scene, model, or style from the Marketplace to your account no longer fails with a "not found" error on new accounts or accounts that haven't generated anything yet. The link to your account is now created automatically.

Previously, the action could fail in these cases.