Allow event groups to be empty

Some events may not require a group to be provided. Also, this will
allow events to define the group(s) to be used by the actions directly
on the action.

Ex) A case of defining groups on the event's actions may be that a set
of actions are run by the same event trigger but have parameters
specific to the different groups.

Change-Id: Icbbaaf4cd36b97c30ba33164ae75dbd687a779a7
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
1 file changed