small bug fix for feeds if feed module is not present.

app/helpers/orbit_helper.rb

@@ -384,6 +384,9 @@ module OrbitHelper
   # get feeds for the module
 
   def self.get_feed_for_module(type)
+    if ModuleApp.where(:key => "feed").count == 0 
+      return []
+    end
     categories = []
     ma = nil
     if type == "index"