Use where instead of find to prevent 404

app/controllers/api/users_controller.rb

@@ -19,7 +19,7 @@ module Api
 
       raise OSM::APIBadUserInput, "No users were given to search for" if ids.empty?
 
-      @users = User.visible.find(ids)
+      @users = User.visible.where(:id => ids)
 
       # Render the result
       respond_to do |format|

app/views/api/users/index.xml.builder

@@ -1,4 +1,4 @@
 xml.instruct! :xml, :version => "1.0"
 xml.osm(OSM::API.new.xml_root_attributes) do |osm|
-  osm << render(@users)
+  osm << (render(@users) || "")
 end