Fixed bug causing device preset to be processed twice in some cases.

db.coffee

@@ -59,6 +59,7 @@ getPresets = (callback) ->
       callback(presets, objects)
       return
 
+    if not presets
       presetsCollection.find().toArray((err, p) ->
         throw err if err
         presets = p
@@ -67,6 +68,7 @@ getPresets = (callback) ->
         callback(presets, objects) if objects
       )
 
+    if not objects
       objectsCollection.find().toArray((err, o) ->
         throw err if err
         objects = {}