[python-committers] How to retry backport?

[Eric V. Smith]

https://github.com/python/cpython/pull/8745

This failed (I think travis, but can't tell now). I thought I could 
close it and re-open it to get it to retry, but apparently not. When I 
closed it, the backport branch was deleted. At this stage, how do I get 
the backport to try again?

I have spotty internet access, so it might take me a while to try this 
again.

Thanks.

Eric