The change e94bac071aa42fa45ad30d92f975d6d7c114e16a was landed prematurely and introduced

a some regressions. Some of them were fixed in 3a74bdfaee929403eb7ada0c38d286e6c27d0d20 but

a couple remained.
In RB.UploadAttachmentView, the options in initialize needs to be defaulted to an

empty object to prevent reference errors. In addition, the function was referencing 

this.presetCaption and this.attachmentHistory, which were undefined. This caused the 

dialog to have a blank caption when file attachments were updated.

dialogView unit tests still pass

Manual testing:
Adding a file attachment:

- opening the dialog, uploading a file, and submitting it (without editing the caption)

- opening the dialog, uploading a file, editing the caption, and submitting it

- opening the dialog, editing the caption, uploading a file, and submitting it

- opening the dialog, uploading a file, then cancelling the dialog

- opening the dialog, editing the caption, then cancelling the dialog

- opening the dialog, then cancelling the dialog without uploading anything

- verified the 'Upload' button is disabled unless a file is actually uploaded
Updating a file attachment:

- editing the caption for a file attachment inline and then opening the update dialog

to check that the caption is consistent

- opening the update dialog and cancelling the dialog without uploading anything new

- updating a file attachment without changing the caption 

- updating a file attachment and changing the caption

- verified the 'Upload' button is disabled unless a new file is actually uploaded