[lib] Fix duplication of transition during export of a model with macro node;...

[lib] Fix duplication of transition during export of a model with macro node; The only thing kept from the old code...

library/cadbiom/models/guard_transitions/translators/chart_xml.py

@@ -185,13 +185,13 @@ class XmlVisitor:
         """
         self.check_name(mnode.name)
         save_macro = self.current_element
-        tag = "CMacroNode"
+        macro_node_tag = "CMacroNode"
         # Get attributes
         # Keys: attr names; Values: attr values
-        attrs = self.get_existing_attributes(mnode)
+        macro_node_attrs = self.get_existing_attributes(mnode)
 
         # Create new XML tag
-        macro = etree.SubElement(self.current_element, tag, attrs)
+        macro = etree.SubElement(self.current_element, macro_node_tag, macro_node_attrs)
         self.current_element = macro
 
         # nodes
@@ -209,7 +209,7 @@ class XmlVisitor:
 
         self.current_element = save_macro
 
-        return tag, attrs
+        return macro_node_tag, macro_node_attrs
 
     def visit_ctop_node(self, tnode):
         """Interative build of XML tree for model saving