Revert "Use default parameter of get method instead of “à la shell” expressions."

This reverts commit 99d1c52c.

My mistake. We used :
  dict.get("key") or "default"
instead of :
  dict.get("key", "default")

because some time dict["key"] is None.

master/bt5/vifib_slap/WorkflowTemplateItem/portal_workflow/person_slap_interface_workflow/scripts/Person_requestSoftwareInstance.xml

@@ -59,11 +59,11 @@ portal = person.getPortalObject()\n
 kwargs = state_change.kwargs\n
 software_release_url_string = state_change.kwargs[\'software_release\']\n
 software_title = kwargs["software_title"]\n
-software_type = kwargs.get("software_type", "RootSoftwareInstance")\n
+software_type = kwargs.get("software_type") or "RootSoftwareInstance"\n
 instance_xml = kwargs["instance_xml"]\n
-sla_xml = kwargs.get("sla_xml", "")\n
+sla_xml = kwargs.get("sla_xml") or ""\n
 is_slave = kwargs.get("shared", False)\n
-state = kwargs.get(\'state\', \'started\')\n
+state = kwargs.get(\'state\') or \'started\'\n
 \n
 sale_order_portal_type = "Sale Order"\n
 sale_order_line_portal_type = "Sale Order Line"\n

master/bt5/vifib_slap/bt/revision

-448
\ No newline at end of file
+449