26.1-rc1: Gnus issue when signing message / prompting for passphrase

[Joseph Mingrone]

Hello,

I have been running 26.1-rc1 since the 16th and things have been smooth.

I did have to change the value of `epa-pinentry-mode' to 'loopback to get 
prompted for a passphrase when opening an encrypted file.  But, when sending 
messages in Gnus with `mml-secure-message-sign', instead of being prompted for 
the passphrase, a 'Wrong type argument: char-or-string-p, nil' error is 
reported, which I believe occurs in or around `mml-compute-boundary'.

Joseph

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