Add test to ensure errors does not popup when action_name is not defined

CHANGELOG.rdoc

@@ -11,7 +11,7 @@
 
 * bug fix
   * Search for validations on both association and attribute
-  * Use controller.action_name to lookup actoin only when available, to fix issue with Rspec views tests (by github.com/rafaelfranca)
+  * Use controller.action_name to lookup action only when available, to fix issue with Rspec views tests (by github.com/rafaelfranca)
 
 == 1.2.2
 

lib/simple_form/inputs/base.rb

@@ -131,7 +131,9 @@ module SimpleForm
 
       # The action to be used in lookup.
       def lookup_action
-        action = template.controller.action_name.to_sym if template.controller.action_name
+        return unless template.controller.action_name
+
+        action = template.controller.action_name.to_sym
         ACTIONS[action] || action
       end
     end

test/components/label_test.rb

@@ -58,6 +58,15 @@ class LabelTest < ActionView::TestCase
     end
   end
 
+  test 'label should not explode while looking for i18n translation when action is not set' do
+    def @controller.action_name; nil; end
+
+    assert_nothing_raised do
+      with_label_for @user, :description, :text
+    end
+    assert_select 'label[for=user_description]'
+  end
+
   test 'label should use i18n based on model and attribute to lookup translation' do
     store_translations(:en, :simple_form => { :labels => { :user => {
       :description => 'Descrição'