slapos_subscription: Set default values.

master/bt5/slapos_subscription_request/SkinTemplateItem/portal_skins/slapos_subscription_request/SubscriptionRequest_processRequest.py

@@ -2,7 +2,6 @@ if context.getAggregate() is not None:
   return
 
 person = context.getDestinationSectionValue()
-
 if person is None:
   return
 
@@ -10,14 +9,22 @@ if context.getSimulationState() == "confirmed":
   return
 
 request_kw = {}
+default_xml = """<?xml version="1.0" encoding="utf-8"?>
+<instance>
+</instance>
+"""
+
+if context.getUrlString() is None:
+  raise ValueError("url_string cannot be None")
+
 request_kw.update(
     software_release=context.getUrlString(),
     # Bad title
     software_title=context.getTitle() + " %s" % str(context.getUid()),
-    software_type=context.getSourceReference(),
-    instance_xml=context.getTextContent().strip(),
-    sla_xml=context.getSlaXml().strip(),
-    shared=context.getRootSlave(),
+    software_type=context.getSourceReference("default"),
+    instance_xml=context.getTextContent(default_xml).strip(),
+    sla_xml=context.getSlaXml(default_xml).strip(),
+    shared=bool(context.getRootSlave(0)),
     state="started",
   )