bug#63373: [PATCH] 30.0.50; Bug in tramp-ssh-controlmaster-options

[Benson Chu]

Hello, I am using tramp with an old version of ssh (6.6.1), which
doesn't have the -G options. #'tramp-ssh-controlmaster-option is assumed
to return a string, and with my version of ssh,
#'tramp-ssh-controlmaster-option returns nil due to the recent changes
adding the "suppress" option.

This patch fixes the bug, returning an empty string where previously nil
was returned.


In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.17.8, Xaw scroll bars) of 2023-05-07 built on ArchDawn
Repository revision: d5ab8b6f2459b0c0111edc1ac7da20e1452c1f33
Repository branch: safe-to-build
Windowing system distributor 'The X.Org Foundation', version 11.0.12101008
System Description: Arch Linux

Configured using:
 'configure --with-native-compilation --with-tree-sitter
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Features:
(shadow sort mail-extr emacsbug magit-patch macros tabify
org-roam-dailies scheme slime-asdf ...)

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