empty_d shape property (#1666)

lib/elements/empty_d_object.py

@@ -23,6 +23,7 @@ class EmptyDObject(EmbroideryElement):
         label = self.node.get(INKSCAPE_LABEL) or self.node.get("id")
         yield EmptyD((0, 0), label)
 
+    @property
     def shape(self):
         return
 

lib/extensions/object_commands.py

@@ -34,6 +34,6 @@ class ObjectCommands(CommandsExtension):
         seen_nodes = set()
 
         for element in self.elements:
-            if element.node not in seen_nodes and element.shape():
+            if element.node not in seen_nodes and element.shape:
                 add_commands(element, commands)
                 seen_nodes.add(element.node)