[Octave-bug-tracker] [bug #55023] gnuplot_binary test fails if there's no gnuplot and leaves incorrect configuration

[Rik]

Follow-up Comment #7, bug #55023 (project octave):

The point I wanted to make is that an unwind_protect/unwind_protect_cleanup is
not the optimal strategy.  The current set of tests already restores the
original value of gnuplot_binary, so there is no need to run cleanup code
every time which repeats that.  On the other hand, if the tests fail for any
reason then you do want to restore the original values.  This calls out for a
try/catch strategy.

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