Fix downloading remote media files when server returns empty filename (#14867)

Fixes #14817

lib/paperclip/response_with_limit_adapter.rb

@@ -16,7 +16,7 @@ module Paperclip
     private
 
     def cache_current_values
-      @original_filename = filename_from_content_disposition || filename_from_path || 'data'
+      @original_filename = filename_from_content_disposition.presence || filename_from_path.presence || 'data'
       @size = @target.response.content_length
       @tempfile = copy_to_tempfile(@target)
       @content_type = ContentTypeDetector.new(@tempfile.path).detect