bug#30063: 26.0.90; Silent fail with `rst-compile-pdf-preview'

[Lars Ingebrigtsen]

Simen Heggestøyl <simenheg@gmail.com> writes:

> * lisp/textmodes/rst.el (rst-compile-pdf-preview): Warn about missing
> executables when attempting to compile and preview an RST file as PDF.
> (Bug#30218)

[...]

> +    (unless (executable-find pdf-compile-program)
> +      (error "Cannot find executable `%s'" pdf-compile-program))
> +    (unless (executable-find rst-pdf-program)
> +      (error "Cannot find executable `%s'" rst-pdf-program))

Others pointed out that it might be nice to report error messages back
from the pdf commands, and that's true, but I think this patch makes
sense, too, because it gives good, early feedback on a likely problem,
so I think it should be applied.

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