Multiple Registration Fire Ajax Error When Attempting To Remove Pictures

While this is a module error, we'll need to dedicate time to it as being able to be accurately represented is a serious concern for our userbase.

---DEV NOTE---
Fixed the following line of code:

multiple_registration.module line 215

$paragraphs_with_removed_mode = (!isset($form_state->getTriggeringElement()['#paragraphs_mode']) && ($form_state->getTriggeringElement()['#paragraphs_mode'] !== 'removed'));

should be using isset instead of !isset.  The way it existed actually ensured that this error would arise by only checking the contents of #paragraphs_mode if it didn't exist. 

--DEV NOTE CONT.--

Turns out there were some major issues in general with Multiple Registration.  We've rolled it back to a stable version.