Add missing import

aleksis/apps/tezor/rules.py

@@ -3,6 +3,8 @@ import rules
 from .models.base import Client
 from .models.invoice import Invoice, InvoiceGroup
 
+from aleksis.core.util.predicates import has_person
+
 # View clients
 view_clients_predicate = has_person & (
     has_global_perm("tezor.view_client") | has_any_object("tezor.view_client", Client)