fix: Fix undefined behavior in sample_motifs(sample = NULL)

[krlmlr]

Closes #1564.

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[szhorvat]

Suggested change

	as.numeric(cut.prob), as.numeric(sample.size), sample
	as.numeric(cut.prob), as.numeric(sample.size), if (!is.null(sample) as_igraph_vs(graph, sample)-1 else NULL

I think the correct way to proceed is what I outline above. Can you change this before merging, @krlmlr ?

[szhorvat]

Please use #1568 instead. I marked this as draft for safety, to make sure you see this message.

[szhorvat]

Please use #1568 instead

#15698 was merged, so closing this one.