#JC-1198.  Block the transition to non-existent pages (except search results).
Merge branch 'master' of https://github.com/jtalks-org/jcommune
Merge branch 'master' of https://github.com/jtalks-org/jcommune

Conflicts:
	jcommune-model/src/test/java/org/jtalks/jcommune/model/dao/hibernate/TopicHibernateDaoTest.java
After merging fixes.
#JC-1198. Fix.
Merge branch 'master' of https://github.com/jtalks-org/jcommune