Error when updating metadata on events with no instances

[edtjones]

If you hit the /update_metadata endpoint for an event which doesn't have instances, you get the following error:

Notice: Undefined offset: 0 in /srv/www/rooftop-cms/public/web/app/plugins/rooftop-events/public/class-rooftop-events-public.php on line 257
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\nNotice: Trying to get property of non-object in /srv/www/rooftop-cms/public/web/app/plugins/rooftop-events/public/class-rooftop-events-public.php on line 260
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\nFatal error: Call to a member function format() on a non-object in /srv/www/rooftop-cms/public/web/app/plugins/rooftop-events/public/class-rooftop-events-public.php on line 260

[edtjones]

not urgent - can work around