Merge pull request #633 from Shopify/backport_argument_error

backport argument error fix

lib/liquid/standardfilters.rb

@@ -316,7 +316,7 @@ module Liquid
       else
         nil
       end
-    rescue ArgumentError
+    rescue ::ArgumentError
       nil
     end
 

test/integration/standard_filter_test.rb

@@ -379,6 +379,11 @@ class StandardFiltersTest < Minitest::Test
     assert_template_result('a',"{{ 'a' | to_number }}")
   end
 
+  def test_date_raises_nothing
+    assert_template_result('', "{{ '' | date: '%D' }}")
+    assert_template_result('abc', "{{ 'abc' | date: '%D' }}")
+  end
+
   private
 
   def with_timezone(tz)