Revert "don't raise NoMethodError the tried method doesn't exists"

This reverts commit 29a5aeaae9.

activesupport/lib/active_support/core_ext/object/try.rb

@@ -28,8 +28,6 @@ class Object
   def try(*a, &b)
     if a.empty? && block_given?
       yield self
-    elsif !a.empty? && !respond_to?(a.first)
-      nil
     else
       __send__(*a, &b)
     end

activesupport/test/core_ext/object_and_class_ext_test.rb

@@ -99,7 +99,7 @@ class ObjectTryTest < Test::Unit::TestCase
   def test_nonexisting_method
     method = :undefined_method
     assert !@string.respond_to?(method)
-    assert_nil @string.try(method)
+    assert_raise(NoMethodError) { @string.try(method) }
   end
   
   def test_nonexisting_method_with_arguments