Fix build attempt
I think this is container specific. Change default input variable back to
what it previously was before my prior change.
@@ -149,7 +149,7 @@ class TimedProcessRunner(threading.Thread):
self.process = None
self.timeout = 0
- def communicate(self, process, timeout, input=''):
+ def communicate(self, process, timeout, input=None):
"""Call process.communicate(), but throw exception if it has not completed
before 'timeout' seconds have elapsed"""
