Feature request: mainland with 1 clade about daisiemainland HOT 4 CLOSED

I've added this on the branch richel_allow_1_mainland_clade with commit 4005805 (in the case I need to revert this myself :-) )

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Note that I do feel that, when using only 1 clade, the mainland extinction rate must be zero. I am unsure if this is correct. I do understand that if the one species goes extinct, there needs to be a new species somewhere (and now the code will give an error, e.g. the code below)

  mainland <- sim_mainland(
    total_time = 100,
    m = 1,
    mainland_ex = 1)

gives:

Error in sample.int(length(x), size, replace, prob) : 
  invalid first argument 

as

branch_spec <- DDD::sample2(spec_id_sample, 1)

is called with spec_id_sample is NULL.

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@richelbilderbeek Thanks for the great start on this issue, I will use this to complete the issue.

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Issue finished, will close when merged to main.

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