fetchOwnList returns all models when not called createWithCurrentUser

[friedger]

When createWithCurrentUser is not called before calling fetchOwnList then an exception should be thrown or so.

Currently, all models are returned. That is confusing.

[jessicaanhdao]

I have the same problem. IDK what caused this....

[hstove]

Yes, an exception should be thrown, although the application should not use this method if the user is not signed in.