MNT : only set the figure call back if figure is not None

tacaswell · tacaswell · commit 46af65a1ba85 · 2015-05-25T00:50:34.000-04:00
diff --git a/lib/matplotlib/artist.py b/lib/matplotlib/artist.py
@@ -605,8 +605,9 @@ def set_figure(self, fig):
         ACCEPTS: a :class:`matplotlib.figure.Figure` instance
         """
         self.figure = fig
-        self.add_callback(_dirty_figure_callback)
-        self.pchanged()
+        if self.figure and self.figure is not self:
+            self.add_callback(_dirty_figure_callback)
+            self.pchanged()
 
     def set_clip_box(self, clipbox):
         """
