wxGUI/animation: attempt to fix animation tool for Mac

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@54826 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/animation/mapwindow.py

@@ -105,7 +105,7 @@ class AnimationWindow(BufferedWindow):
                  style = wx.DEFAULT_FRAME_STYLE | wx.FULL_REPAINT_ON_RESIZE | wx.BORDER_RAISED):
         Debug.msg(2, "AnimationWindow.__init__()")
 
-        self.bitmap = wx.EmptyBitmap(0, 0)
+        self.bitmap = wx.EmptyBitmap(1, 1)
         self.x = self.y = 0
         self.text = ''
         self.size = wx.Size()