Merge pull request #276 from zhengbli/msmaster_fixFormatOnkeyOnSublime2

Fix formatOnKey on Sublime2

Author: zhengbli

typescript/listeners/format.py

@@ -27,8 +27,10 @@ def on_modified_with_info(self, view, info):
             redo_command = view.command_history(1)[0]
             log.debug("last_command:{0}, args:{1}".format(last_command, args))
             log.debug("redo_command:{0}".format(redo_command))
-            if redo_command != "":
-                # in an undo session, avoid running format_on_key
+            if redo_command != "" and redo_command is not None:
+                # in an undo session, avoid running format_on_key. For
+                # a non-undo session in ST3, the redo_command is an empty 
+                # string; in ST2, the redo_command is None
                 return 
 
             if last_command == "insert":