The JSPUI assumes that an existent Bundle named original mean that there are uploaded files from the user. With this assumption it show the upload-file-list jsp instead of the file-choose-upload ant thrown a NPE. The same problem happen on the verify step.
Also the flash page of an item with an empty orignal bundle is wrong: there is an empty table instead of the message "no files available".
To reproduce the bug you need to create the item using the API or to do an ingest using the DSpaceMETSIngester (the SWORD default implementation use it). Send the submission trought the workflow system and reject the item. Resuming the submission will thrown the NPE