slapos_jio: Use text_content for instance_xml and sets a default (if the user don' input)

master/bt5/slapos_jio/SkinTemplateItem/portal_skins/slapos_hal_json_style/SoftwareRelease_requestHostingSubscription.py

@@ -31,12 +31,18 @@ if person is None:
 if software_type in [None, ""]:
   software_type = "RootSoftwareInstance"
 
+if text_content == "":
+  text_content = """
+<?xml version="1.0" encoding="utf-8" ?>
+<instance>
+</instance>"""
+
 request_kw = {}
 request_kw.update(
   software_release=url,
   software_title=title,
   software_type=software_type,
-  instance_xml=instance_xml,
+  instance_xml=text_content,
   sla_xml="",
   shared=shared,
   state="started",

master/bt5/slapos_jio/SkinTemplateItem/portal_skins/slapos_hal_json_style/SoftwareRelease_requestHostingSubscription.xml

@@ -50,7 +50,7 @@
         </item>
         <item>
             <key> <string>_params</string> </key>
-            <value> <string>title, instance_xml="", software_type=None, shared=False, computer_guid=None</string> </value>
+            <value> <string>title, text_content="", software_type=None, shared=False, computer_guid=None</string> </value>
         </item>
         <item>
             <key> <string>id</string> </key>