orthogene fails rcmdcheck when ape isn't installed

[willgearty]

ape is only in Suggests, but it is called here:

orthogene/R/prepare_tree.R

Lines 129 to 130 in bc242c5

	tr <- ape::drop.tip(phy = tr,
	tip = tr$tip.label[unmapped])

This is ultimately called in one of the examples for plot_orthogene():

orthogene/R/plot_orthotree.R

Line 54 in bc242c5

#' orthotree <- plot_orthotree(species = c("human","monkey","mouse"))

If ape is not installed rcmdcheck then fails. We've encountered this when trying to run a reverse dependencies check for rphylopic: https://github.com/palaeoverse/rphylopic/actions/runs/8524983850/job/23352044794

This example should be skipped if ape is not installed. You should also probably have some sort of graceful failure if ape is not installed and the user runs a similar command.

[bschilder]

Thanks for reporting this @willgearty , I'll make a fix and push it to GH/Bioc!