Fiw bug related to Vista subprocess call error

IPython/frontend/_process/killableprocess.py

@@ -151,7 +151,10 b' else:'
             self._thread = ht
             self.pid = pid
 
+            try:
             winprocess.AssignProcessToJobObject(self._job, hp)
+            except WindowsError:
+                pass
             winprocess.ResumeThread(ht)
 
             if p2cread is not None: