NO-JIRA - Fixed missing import
@@ -23,7 +23,7 @@ from __future__ import division
from __future__ import absolute_import
from __future__ import print_function
-import signal, optparse
+import sys, signal, optparse
from proton.handlers import MessagingHandler
from proton.reactor import Container
from proton import Array, Data, symbol, UNDESCRIBED
