[bug#57850] Marionette fix + improvement

[Christopher Baines]

I think the 2nd patch to avoid the read error helps with the cgit system
test at least.

Christopher Baines (2):
  marionette: Make it easier to debug REPL read failures.
  marionette: Avoid read error when wait-for-file file is empty.

 gnu/build/marionette.scm | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

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