Restructured the MultiChoice Widget's render method a little.

lib/widget/filters/multi_choice.rb

@@ -3,26 +3,17 @@ class Widget::Filters::MultiChoice < Widget::Filters::Base
   def render
     content_tag :td do
       content_tag :div, :id => "#{filter_class.underscore_name}_arg_1", :class => "filter_values" do
-        content = ''
-        available_values = filter_class.available_values
-        available_values.each_with_index do |(label, value), i|
-          label = content_tag :label,
-                      :for => "#{filter_class.underscore_name}_radio_option_#{i}",
-                      :'data-filter-name' => filter_class.underscore_name do
-            radio_button = content_tag :input,
-                      :type => 'radio',
-                      :name => "#{filter_class.underscore_name}_arg_1_val",
+        choices = filter_class.available_values.each_with_index.map do |(label, value), i|
+          radio_button = tag :input,
+              :type => "radio", :name => "#{filter_class.underscore_name}_arg_1_val",
               :id => "#{filter_class.underscore_name}_radio_option_#{i}",
               :class => "#{filter_class.underscore_name}_radio_option",
-                      :value => value do
-              ''
-            end
-            radio_button + label
-          end
-          br = (i == available_values.size - 1) ? '' : content_tag(:br) {}
-          content += (label + br)
+              :value => value
+          content_tag :label, radio_button + label,
+              :for => "#{filter_class.underscore_name}_radio_option_#{i}",
+              :'data-filter-name' => filter_class.underscore_name
         end
-        content.html_safe
+        choices.join(content_tag(:br)).html_safe
       end
     end
   end