--- a/sat_frontends/tools/xmlui.py	Tue Jul 09 09:06:45 2019 +0200
+++ b/sat_frontends/tools/xmlui.py	Thu Jul 11 09:21:10 2019 +0200
@@ -466,6 +466,10 @@
                 elif type_ == "label":
                     cont = self.widget_factory.createLabelContainer(_xmlui_parent)
                     self._parseChilds(
+                        # FIXME: the "None" value for CURRENT_LABEL doesn't seem
+                        #        used or even useful, it should probably be removed
+                        #        and all "is not None" tests for it should be removed too
+                        #        to be checked for 0.8
                         cont, node, ("widget", "container"), {CURRENT_LABEL: None}
                     )
                 elif type_ == "advanced_list":
@@ -541,8 +545,10 @@
                 ):
                     # current widget is ignored, but there may be already a label
                     if CURRENT_LABEL in data:
-                        # if so, we remove it from parent
-                        _xmlui_parent._xmluiRemove(data.pop(CURRENT_LABEL))
+                        curr_label = data.pop(CURRENT_LABEL)
+                        if curr_label is not None:
+                            # if so, we remove it from parent
+                            _xmlui_parent._xmluiRemove(curr_label)
                     continue
                 type_ = node.getAttribute("type")
                 value_elt = self._getChildNode(node, "value")
@@ -689,9 +695,11 @@
                 ctrl._xmlui_name = name
                 _xmlui_parent._xmluiAppend(ctrl)
                 if CURRENT_LABEL in data and not isinstance(ctrl, LabelWidget):
-                    # this key is set in LabelContainer, when present
-                    # we can associate the label with the widget it is labelling
-                    data.pop(CURRENT_LABEL)._xmlui_for_name = name
+                    curr_label = data.pop(CURRENT_LABEL)
+                    if curr_label is not None:
+                        # this key is set in LabelContainer, when present
+                        # we can associate the label with the widget it is labelling
+                        curr_label._xmlui_for_name = name
 
             else:
                 raise NotImplementedError(_("Unknown tag [%s]") % node.nodeName)