[Misc] If the Extension script service is not present, don't display any name but still display the version

* test leftover

XWIKI-14591: Discourage or prevent users to move/rename pages from Extensions

* Tell yui compressor to not remove the comment with the Velocity code when minifying the JavaScript
* The JavaScript/CSS files from xwiki-platform-web WAR are minified in place (we don't provide the unminified version).

XWIKI-15137: TemplateManager should not generate an empty RawBlock if the result of the template execution is empty

* fix tests

* improve test

* fix test

* Add license header.

XWIKI-15134: Page translations are not re-indexed when shared meta data is updated on the default translation

    XWIKI-14591: Discourage or prevent users to move/rename pages from Extensions

* Make sure we get the objects and attachments from the default traslation.

XWIKI-14591: Discourage or prevent users to move/rename pages from Extensions