The attribute dict passed to render_odg can contain empty lists

If there is no attribute on a node, the an empty list will be adedd. So it's
required to check if the list corresponding to the current node is not empty
before applying attributes update.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31526 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/Formulator/Widget.py

@@ -205,18 +205,22 @@ class Widget:
 
     draw_frame_tag_name = '{%s}%s' % (DRAW_URI, 'frame')
     draw_frame_node = Element(draw_frame_tag_name, nsmap=NSMAP)
+    if len(attr_dict.get(draw_frame_tag_name, {})) > 0:
       draw_frame_node.attrib.update(attr_dict.get(draw_frame_tag_name, {}).pop(0))
 
     draw_tag_name = '{%s}%s' % (DRAW_URI, 'text-box')
     draw_node = Element(draw_tag_name, nsmap=NSMAP)
+    if len(attr_dict.get(draw_tag_name, {})) > 0:
       draw_node.attrib.update(attr_dict.get(draw_tag_name, {}).pop(0))
 
     text_p_tag_name = '{%s}%s' % (TEXT_URI, 'p')
     text_p_node = Element(text_p_tag_name, nsmap=NSMAP)
+    if len(attr_dict.get(text_p_tag_name, {})) > 0:
       text_p_node.attrib.update(attr_dict.get(text_p_tag_name, {}).pop(0))
 
     text_span_tag_name = '{%s}%s' % (TEXT_URI, 'span')
     text_span_node =  Element(text_span_tag_name, nsmap=NSMAP)
+    if len(attr_dict.get(text_span_tag_name, {})) > 0:
       text_span_node.attrib.update(attr_dict.get(text_span_tag_name, {}).pop(0))
 
     text_p_node.append(text_span_node)