Return a 16x16 empty bitmap (bitmap loader) if we got an error (missing icon or other WTF cases)

gui/bitmapLoader.py

@@ -69,6 +69,9 @@ def getBitmap(name,location):
         bmp = cachedBitmaps[path]
 
 #    print "#BMPs:%d - Current took: %.8f" % (cachedBitmapsCount,time.clock() - start)
+    if bmp is None:
+        bmp = wx.EmptyBitmap(16,16)
+
     return bmp
 
 def getImage(name, location):