Add test for sending emails.

Add backup email if there isn't an MIC

RIGS/signals.py

@@ -1,4 +1,5 @@
 import reversion
+from django.conf import settings
 
 from django.core.mail import EmailMessage
 from django.template.loader import get_template
@@ -15,10 +16,16 @@ def send_eventauthorisation_success_email(instance):
         get_template("RIGS/eventauthorisation_client_success.txt").render(context),
         to=[instance.email]
     )
+
+    if instance.event.mic:
+        mic_email_address = instance.event.mic.email
+    else:
+        mic_email_address = settings.AUTHORISATION_NOTIFICATION_ADDRESS
+
     mic_email = EmailMessage(
         "N%05d | %s - Event Authorised".format(instance.event.pk, instance.event.name),
         get_template("RIGS/eventauthorisation_mic_success.txt").render(context),
-        to=[instance.event.mic.email]
+        to=[mic_email_address]
     )
 
     client_email.send()