Don't leak out minimum or maximum values when MinMax component is in …

…use.

It used to emit the last calculated value in bare string just before
label.

lib/simple_form/components/min_max.rb

@@ -7,6 +7,7 @@ def min_max
           input_html_options[:min] ||= minimum_value(validator_options)
           input_html_options[:max] ||= maximum_value(validator_options)
         end
+        nil
       end
 
       private

test/inputs/numeric_input_test.rb

@@ -164,4 +164,10 @@ class NumericInputTest < ActionView::TestCase
       assert_select 'input[max=99]'
     end
   end
+
+  test 'min_max should not emit max value as bare string' do
+    with_input_for @other_validating_user, :age, :integer
+    assert_select 'div', {:count => 0, :text => %r{^99}}
+  end
+
 end