[MERGE] Fixed bug related to test_iter_changes_new breakage on Windows

[Alexander Belchenko]

Alexander Belchenko has voted +1 (conditional).
Status is now: Conditionally approved
Comment:
I was wrong, sorry.
But this test don't fail until WT4. So I'm worry about some little 
latent bug in WT4.

How about following fix:

             if not supports_executable():
-                executable = entry.executable
+                executable = bool(entry) and entry.executable
             else:
                 executable = bool(stat.S_ISREG(mode) and stat.S_IEXEC & 
mode)




For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C461E1FE4.90108%40hlabs.spb.ru%3E