check_empty_beautier_folder()
# TRUE
is_mrca_prior(create_mrca_prior())
# Also 'NA' is a valid MRCA prior,
# denoting that there no MRCA priors
is_mrca_prior(NA)
# FALSE
is_mrca_prior(NULL)
is_mrca_prior("nonsense")
check_empty_beautier_folder()
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