Update filter of StatisticsAnnouncement

Only present to the user documents without an unpublished
edition in the results page for filtering documents to
connect to a StatisticsAnnouncement. This prevents a user connecting a
draft edition which had unintended consequence of publishing the draft
when the StatisticsAnnouncement was saved.

Author: patrickpatrickpatrick

app/controllers/admin/statistics_announcement_publications_controller.rb

@@ -35,7 +35,7 @@ def params_filters
   end
 
   def params_filters_with_default_state
-    params_filters.reverse_merge("state" => "active")
+    params_filters.reverse_merge("state" => "active", "without_not_published" => true)
   end
 
   def edition_filter_options