[NEXUS-6767] Do automatic anonymous sign-on on all requests not only on status request

https://issues.sonatype.org/browse/NEXUS-6767
http://bamboo.s/browse/NX-OSSF236

Problem was that as we only did the automatic anonymous sign-on only on status request other requests that were done prior to status, such as retrieving permissions, were done without anonymous user being signed in
Yes, as in that case user can still use the UI as when anonymous would not be enabled. If we do not eat the exception all requests will fail.