Upload of models without authentication

[nagavijays]

Steps Taken:
In Vorto repository, when the url is diretly typed http://<>/#/upload from browser, the share model screen is shown to the screen, and user is allowed to upload models without authentication.
Expected behavior:
The Share model screen should provide error message when user trying to upload models without authentication.
Actual behavior:
Users are allowed to upload models without authentication.