Close graphics dev in finally clause\ncloses #4408 (already closed)

IPython/extensions/rmagic.py

@@ -624,8 +624,8 b' class RMagics(Magics):'
                 print(e.err)
             rmtree(tmpd)
             return
-
-        self.r('dev.off()')
+        finally:
+            self.r('dev.off()')
 
         # read out all the saved .png files