XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.

* Bug fix: template property group tried to load an object event when the document is new.
Merge pull request #205 from gdelhumeau/master

XWIKI-9516: Create a new Wiki API that replaces xwiki-platform-wiki-manager and xwiki-platform-workspace.
* Bug fix: template property group tried to load an object event when the document is new.