development: [PyOne] prevent dropping empty values in template

src/oca/python/pyone/util.py

@@ -1,6 +1,6 @@
 # Copyright 2018 www.privaz.io Valletech AB
 # Copyright 2002-2018, OpenNebula Project, OpenNebula Systems
-# 
+#
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
@@ -46,7 +46,8 @@ def cast2one(param):
             root = list(param.values())[0]
             if isinstance(root, dict):
                 # We return this dictionary as XML
-                return dicttoxml.dicttoxml(param, root=False, attr_type=False).decode('utf8')
+                return dicttoxml.dicttoxml(param, root=False, attr_type=False,
+                                           cdata=True).decode('utf8')
             else:
                 # We return this dictionary as attribute=value vector
                 ret = u""
@@ -72,6 +73,14 @@ def one2dict(element):
     return element._root
 
 
+def none2emptystr(d):
+    for k,v in d.items():
+        if type(v) == OrderedDict:
+            none2emptystr(v)
+        elif v == None:
+            d[k] = ""
+
+
 def child2dict(element):
     '''
     Creates a dictionary from the documentTree obtained from a binding Element.
@@ -93,6 +102,9 @@ def child2dict(element):
     if ret[tagName] == None:
         ret[tagName] = OrderedDict()
 
+    # Replace 'None' values returned by xmltodict by ""
+    none2emptystr(ret)
+
     # return the contents dictionary, but save a reference
     ret[tagName]._root = ret
     return ret[tagName]