[fix] can not to_draft

netforce_clinic/models/hd_case.py

@@ -980,6 +980,7 @@ class HDCase(Model):
             'state': state,
         })
         # update sickbed
+        if obj.sickbed_id:
             obj.sickbed_id.write({
                 'available': False,
             })

netforce_clinic/models/visit.py

@@ -1,4 +1,5 @@
 import time
+
 from datetime import datetime, timedelta
 
 from netforce.model import Model, fields, get_model