Fix small bug in tornado, not catching AttributeError when no multiprocessing...

Fix small bug in tornado, not catching AttributeError when no multiprocessing is available and trying to check os.sysconfig on Windows

Signed-off-by: miigotu <miigotu@gmail.com>

lib/tornado/process.py

@@ -67,7 +67,7 @@ def cpu_count():
         pass
     try:
         return os.sysconf("SC_NPROCESSORS_CONF")
-    except ValueError:
+    except (ValueError, AttributeError):
         pass
     gen_log.error("Could not detect number of processors; assuming 1")
     return 1