Anonymous user accessing a review with branch review will have "Rolled back transaction" warning

Steps to reproduce

1. Create a review eg: CR-1
2. Choose a branch to be reviewed in CR-1
3. Logout from Crucible
4. Access the review CR-1

   2015-01-08 21:42:02,670 WARN  [qtp1591166013-224 ] fisheye TxHelper-rollbackTxIfNotCommitted - Rolled back transaction
   

5. Login and enable debug logging
6. Logout and access the review again

   2015-01-08 21:42:52,774 WARN  [qtp1591166013-132 ] fisheye TxHelper-rollbackTxIfNotCommitted - Rolled back transaction started from:
   java.lang.Throwable: (Stacktrace at transaction start)
   	at com.cenqua.crucible.hibernate.TxHelper.beginTx(TxHelper.java:26)
   	at com.atlassian.fisheye.spi.impl.DefaultTxTemplate.execute(DefaultTxTemplate.java:108)
   	at sun.reflect.GeneratedMethodAccessor138.invoke(Unknown Source)
   	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   	at java.lang.reflect.Method.invoke(Method.java:606)
   	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
   ...
   	at com.atlassian.crucible.plugins.branchreview.service.DefaultBranchReviewPermissionManager.checkUserCanDoReviewAction(DefaultBranchReviewPermissionManager.java:71)
   	at com.atlassian.crucible.plugins.branchreview.service.DefaultBranchReviewPermissionManager.checkUserCanEditReview(DefaultBranchReviewPermissionManager.java:53)
   	at com.atlassian.crucible.plugins.branchreview.web.contextprovider.TrackedBranchesTableContextProvider.hasPermissionToEditReview(TrackedBranchesTableContextProvider.java:49)
   	at com.atlassian.crucible.plugins.branchreview.web.contextprovider.TrackedBranchesTableContextProvider.isCurrentUserAbleToEditReview(TrackedBranchesTableContextProvider.java:44)