no debug output when shell command hangs

[ahihi]

i am currently debugging a situation where the git grep command invoked by dumb-jump hangs. i hoped to find out the exact command using (setq dumb-jump-debug t), but because the dumb-jump-debug-message call in dumb-jump-run-command happens after the call to shell-command-to-string, the former is never reached.

i found it eventually, but perhaps it would be better to print the command before running it? :)