Be more robust to nil donors and recipients
Merge branch 'master' of https://github.com/somerandomsequence/food-rescue-robot

Conflicts:
	app/views/notifier/admin_short_term_cover_summary.text.erb
	app/views/notifier/volunteer_log_reminder.text.erb
	app/views/notifier/volunteer_log_sms_reminder.text.erb