only send 1 email for rtp expiration notices

proxstar/tasks.py

@@ -80,10 +80,10 @@ def process_expiring_vms_task():
         db = connect_db()
         starrs = connect_starrs()
         pools = get_pools(proxmox, db)
+        expired_vms = []
         for pool in pools:
             user = User(pool)
             expiring_vms = []
-            expired_vms = []
             vms = user.vms
             for vm in vms:
                 vm = VM(vm['vmid'])