[svn r63051] be very careful when we cannot unpickle an

colitem because its parent can't collect
the same way as on the sending side.
(due to platform skips etc.)

--HG--
branch : trunk

py/test/plugin/pytest_pytester.py

@@ -234,10 +234,12 @@ class TmpTestdir:
         bindir = py.path.local(py.__file__).dirpath("bin")
         if py.std.sys.platform == "win32":
             script = bindir.join("win32", scriptname + ".cmd")
+            assert script.check()
+            return self.run(script, *args)
         else:
             script = bindir.join(scriptname)
-        assert script.check()
-        return self.run(py.std.sys.executable, script, *args)
+            assert script.check()
+            return self.run(py.std.sys.executable, script, *args)
 
     def runpytest(self, *args):
         p = py.path.local.make_numbered_dir(prefix="runpytest-",