#67 Fixed passing validations still existing in errors hash.

lib/paperclip/attachment.rb

@@ -117,7 +117,7 @@ module Paperclip
     # Returns true if there are no errors on this attachment.
     def valid?
       validate
-      errors.length == 0
+      errors.empty?
     end
 
     # Returns an array containing the errors on this attachment.
@@ -235,6 +235,7 @@ module Paperclip
           errors[name] = block.call(self, instance) if block
           errors
         end
+        @validation_errors.reject!{|k,v| v == nil }
         @errors.merge!(@validation_errors)
       end
       @validation_errors

test/paperclip_test.rb

@@ -147,7 +147,7 @@ class PaperclipTest < Test::Unit::TestCase
             @dummy.valid?
           end
           should "not have an error when assigned a valid file" do
-            assert_nil @dummy.avatar.errors[validation]
+            assert ! @dummy.avatar.errors.key?(validation)
           end
           should "not have an error on the attachment" do
             assert_nil @dummy.errors.on(:avatar)