Fail more gracefully

[leggsimon]

Currently if we have a problem receiving user data from next-syndication-api we can't properly render the syndication icons because we don't know what they should be for the user.

In some cases the old, smaller icons are rendered which link to http://ftsyndication.com, the now deprecated syndication platform (These were completely removed in #28 )

We should probably render something like we do when syndication is in maintenance mode where they all are red crosses and say there's been an issue or something like that.

Example

[leggsimon]

In order to show a red cross and a "something’s gone wrong" modal I think we should replicate what we do with maintenance mode.

getUserStatus()’s catch should return a custom object like this

n-syndication/src/js/get-user-status.js

Lines 25 to 30 in 22bb892

	if (response.headers.get('content-type').includes('application/json')) {
	return response.json().then(error => {
	error.migrated = true;
	error.MAINTENANCE_MODE = true;
	return error;

And then replicate this

n-syndication/src/js/data-store.js

Lines 42 to 57 in 22bb892

	if (USER_DATA.MAINTENANCE_MODE === true) {
	const fakeRes = itemIDs.map(id => {
	return {
	id,
	canBeSyndicated: 'maintenance',
	messageCode: 'MSG_5100'
	};
	});
	broadcast(`${EVENT_PREFIX}.fetch`, {
	request: itemIDs,
	response: fakeRes
	});
	return Promise.resolve(fakeRes);
	}

and

n-syndication/src/js/modal-download.js

Lines 171 to 176 in 22bb892

	if (USER_DATA.MAINTENANCE_MODE === true) {
	message = MESSAGES.MSG_5100;
	downloadButtonState = 'disabled';
	saveButtonState = 'disabled';
	item.title = '';
	}

with a new custom message defined in config.js