bug#34252: 27.0.50; rmail-get-new-mail fails

[Eli Zaretskii]

> Date: Wed, 30 Jan 2019 18:10:29 +0000 (GMT)
> From: john <jpff@codemist.co.uk>
> Cc: 34252@debbugs.gnu.org
> 
> This could be due to a kernel/NFS problem but te effect on using rmail for 
> my user-base is a real problem.  The problems with proto being nil in
> rmail-remote-proto-p is clearly wrong and despite your statement it does 
> happen to me on two diffrent computers/users attempting to read mail in 
> emacs via rmail.

If you leave only the one change in the place where Glenn said proto
could be nil, and revert the changes in the other two places, does the
problem still happen to you?

Thanks.