Icinga Director v1.5.2

Fixed issues

• You can find issues and feature requests related to this release on our
  roadmap

Configuration rendering

• FIX: Fix compatibility with Icinga v2.6, got broken with v1.5.0 (#1614)

REST API

• FIX: No more invalid JSON in some special circumstances (#1314)

User Interface

• FIX: Hostgroup assignment cache has been fixed (#1574, #1618)

DB Schema

• FIX: missing user/timeperiod constraint. We usually do not touch the schema
  in minor versions, this has been cherry-picked by accident. However, don't
  worry - the migration has been tested intensively.