fix device assignment for non organization clients

apps/pos_device/web/api/v1/viewsets/device.py

@@ -204,7 +204,15 @@ class DeviceAssignmentViewSet(viewsets.ModelViewSet, SoftDeleteMixin):
             data['client'] = client_id
 
         elif client_data and client_data.get('organization') is False:
-            pass
+            # create client
+            client = CustomOperations().custom_create(
+                request=request,
+                view=POSClientViewSet(),
+                data=request.data['client_data']
+            )
+            client_id = client['id']
+
+            data['client'] = client_id
 
         # create assignment
         serializer = self.serializer_class(data=data)