Wrap UsersController to not 500 when no params are submitted

app/controllers/users_controller.rb

@@ -22,7 +22,7 @@ class UsersController < ApplicationController
   def update
 
     password_changed = false
-    u = params[:user]
+    if u = params[:user]
       @user = current_user
 
       u.delete(:password) if u[:password].blank?
@@ -54,6 +54,7 @@ class UsersController < ApplicationController
           @user.aspects.where(:id => u[:a_ids]).update_all(:open => true)
         end
       end
+    end
 
     respond_to do |format|
       format.js{