quarto list extensions change in v1.9

[cderv]

> quarto_list_extensions()
            Id Version Contributes
1 julia-engine   0.1.0            
2  orange-book   0.1.0     formats

which makes test fail

quarto-r/tests/testthat/test-list.R

Line 8 in 24e5bb8

expect_null(quarto_list_extensions())

This is due to quarto change in v1.9

❯ quarto list extensions
Id              Version    Contributes
julia-engine    0.1.0
orange-book     0.1.0      formats   

while previously

❯ quarto list extensions
No extensions are installed in this directory.

Either this is expected change, or we need to improve this on quarto-cli side

This is impacting also

quarto-r/R/remove.R

Lines 30 to 36 in 318912a

	installed_extensions <- quarto_list_extensions()
	if (is.null(installed_extensions)) {
	if (!quiet) {
	cli::cli_alert_warning("No extensions installed.")
	}
	return(invisible(FALSE))
	}