Fix missing t variable in cli

Author: jself

tmuxp/cli.py

@@ -302,6 +302,7 @@ def get_server_from_args(args):
 def command_freeze(args):
     """ Import teamocil config to tmuxp format. """
 
+    t = Server()
     session = t.findWhere({
         'session_name': args.session_name
     })