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add missing allow_none=True in Spawner #216

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Mar 31, 2015
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2 changes: 1 addition & 1 deletion jupyterhub/spawner.py
Original file line number Diff line number Diff line change
Expand Up @@ -303,7 +303,7 @@ class LocalProcessSpawner(Spawner):
help="Seconds to wait for process to halt after SIGKILL before giving up"
)

proc = Instance(Popen)
proc = Instance(Popen, allow_none=True)
pid = Integer(0)

def make_preexec_fn(self, name):
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