500 error when Drupal plugin tries to send html to non-"file" version

The new html segmentation option in the Drupal plugin assumes the version has projectType "file" and sends some content as html files. When this happens, the server responds with a 500 error, and the Drupal plugin reports errors for the HTML files but still reports success for the job overall.

• The server should respond with a more suitable error code and an informative error message when someone tries to upload files to non-files projects.

• The Drupal plugin should report failure for the job overall since not all files could be sent.