Modification key allow access to conf edition but not to display view

[aavilesd]

Events protected by modification key cannot be accessed to its event page view but only the modification one. The expected behavior is that if a user can modify the event he can also access its event page.

Steps to reproduce the error:

• Create any event.
• Go to Management > Protection.
• Set the event as restricted.
• Set a modification key.
• Log in with a non privileged user.
• Access corresponding conferenceModification.py.
• Modification key is requested.
• Change to event page.
• Error message.