Optional radio fields

atst/domain/task_orders.py

@@ -16,6 +16,7 @@ class TaskOrderError(Exception):
 class TaskOrders(object):
     SECTIONS = {
         "app_info": [
+            "portfolio_name",
             "scope",
             "defense_component",
             "app_migration",

atst/forms/task_order.py

@@ -51,6 +51,7 @@ class AppInfoForm(CacheableForm):
         translate("forms.task_order.native_apps.label"),
         description=translate("forms.task_order.native_apps.description"),
         choices=[("yes", "Yes"), ("no", "No"), ("not_sure", "Not Sure")],
+        default="",
         validators=[Optional()],
     )
     complexity = SelectMultipleField(