make notification service use utf8 instead

shared/workspaces/workspaces/notification/services/notification_service.py

@@ -81,8 +81,8 @@ class NotificationService(NotificationServiceIF):
                 if not receiver_email:
                     return "No PI email found."
                 for contact in receiver_email:
-                    r = server.sendmail(sender_email, contact, file.content)
+                    r = server.sendmail(sender_email, contact, file.content.encode("utf8"))
             else:
-                r = server.sendmail(sender_email, receiver_email, file.content)
+                r = server.sendmail(sender_email, receiver_email, file.content.encode("utf8"))
 
         return r