do not convert None labels to 'None' (now in container.py)

segasai · segasai · commit 9c7ff84480e4 · 2012-12-19T15:02:00.000Z
diff --git a/lib/matplotlib/container.py b/lib/matplotlib/container.py
@@ -44,7 +44,10 @@ def set_label(self, s):
 
         ACCEPTS: string or anything printable with '%s' conversion.
         """
-        self._label = '%s' % (s, )
+        if s is not None:
+            self._label = '%s' % (s, )
+        else:
+            self._label = None
         self.pchanged()
 
     def add_callback(self, func):
