Update backend_qt5.py

JGoutin · JGoutin · commit 2ed95149767b · 2016-04-16T11:02:16.000+02:00
diff --git a/lib/matplotlib/backends/backend_qt5.py b/lib/matplotlib/backends/backend_qt5.py
@@ -359,7 +359,7 @@ def minumumSizeHint(self):
 
     def _get_key(self, event):
         if not self._keyautorepeat and event.isAutoRepeat():
-            return
+            return None
 
         event_key = event.key()
         event_mods = int(event.modifiers())  # actually a bitmask
