ENYO-3626: block concurrent calls to OpenDocument


* ENYO-3626: block concurrent calls to OpenDocument 
* ENYO-3626: fix missing next parameter

Related JIRA: https://enyojs.atlassian.net/browse/ENYO-3626

Enyo-DCO-1.1-Signed-off-by: Dominique Dumont <dominique.dumont@hp.com>