There was a bug that displayed the error message with 2 red error boxes around the error message.
Also need another else to handle a new error message from the API, the old one can be removed after the API is deployed. But this can go first. I tested this branch with API master and the API branch with the change. I tested one off SMS and a CSV upload.
they're currently expecting a RecipientsCSV object - but we won't
always have that available if we're handling a single notification.
So make the partials take generic variables, and then use a jinja with
block to pass in the correct values from either the check csv page or
the check notification page.
Additionally set the notification check page to show errors nicely -
hide the send button if there were problems, and replace the header
