[refs #818] fixed some errors

app/models/user.rb

@@ -40,7 +40,7 @@ class User < Avatar
   attr_readonly :uname
   attr_accessor :login
 
-  scope :opened, where('users.role != \'system\'')
+  scope :opened, where('users.role != \'system\' OR users.role IS NULL')
   scope :real, where(:role => ['', nil])
   EXTENDED_ROLES.select {|type| type.present?}.each do |type|
     scope type.to_sym, where(:role => type)

lib/api_defender.rb

@@ -67,6 +67,6 @@ class ApiDefender < Rack::Throttle::Hourly
   end
 
   def system_user? request
-    authorized?(request) && @user.system?
+    authorized?(request) && @user.try(:system?)
   end
 end

spec/integration/api_defender_spec.rb

@@ -33,7 +33,7 @@ describe ApiDefender do
 
   before(:each) do
     @user = FactoryGirl.create :user, :password => @password
-    @system_user = FactoryGirl.create :user, :uname => 'rosa_system'
+    @system_user = FactoryGirl.create :user, :role => 'system'
   end
 
   if APP_CONFIG['anonymous_access'] == true