Handle empty filenames

lib/paperclip/io_adapters/abstract_adapter.rb

@@ -34,7 +34,7 @@ module Paperclip
     private
 
     def destination
-      @destination ||= TempfileFactory.new.generate(@original_filename)
+      @destination ||= TempfileFactory.new.generate(@original_filename.to_s)
     end
 
     def copy_to_tempfile(src)

spec/paperclip/io_adapters/abstract_adapter_spec.rb

@@ -57,6 +57,11 @@ describe Paperclip::AbstractAdapter do
     assert !TestAdapter.new.nil?
   end
 
+  should "can generate a destination filename with no original filename" do
+    @adapter = TestAdapter.new
+    assert_not_nil @adapter.send(:destination).path
+  end
+
   should 'use the original filename to generate the tempfile' do
     @adapter = TestAdapter.new
     @adapter.original_filename = "file.png"