Fixes a bug where #keys is tried on an Array since the earlier #sort …

…coerces

the OrderedHash from group_by into an Array.

(Might only work on Rails >= 2.3.4.)

http://www.caboo.se/articles/2009/5/9/rails-2-3-upgrade-gotcha-aggregate-methods-are-now-orderedhash

app/controllers/graphs_controller.rb

@@ -221,7 +221,7 @@ def target_version_graph
         end
 
         # Set the scope of the graph
-        scope_end_date = issues_by_updated_on.keys.last
+        scope_end_date = issues_by_updated_on.to_a[-1][0] if issues_by_updated_on.size > 0 # Get the last "key".  Rails 2.3 change
         scope_end_date = @version.effective_date if !@version.effective_date.nil? && @version.effective_date > scope_end_date
         scope_end_date = Date.today if !@version.completed?
         line_end_date = Date.today