Steps to reproduce:
1) configure a process engine whereby the property authorizationEnabled is set to false
2) execute AuthorizationService#isAuthorized()

Problem:
AuthorizationService#isAuthorized() executes the authorization check. So that false is returned.

Expected behavior:

• AuthorizationService#isAuthorized() returns true, if the authorization is disabled.
• No authorization check is performed

Hints:
In Admin the tabs Authorization and System are not be visible if the authorization is disabled.