vignette: avoid removing all occs if no NAs #170
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If the user runs the original code on occurrence data with no NAs in the climatic variables (i.e. with zero `occs.na`), `occs[-occs.na, ]` returns and empty dataframe, because `occs[-0, ]` is the same as `occs[0, ]`. Adding this `if()` statement will avoid that, making the vignette code more reproducible for any dataset.
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If the user runs the original code on occurrence data with no NAs in the climatic variables (i.e. with zero
occs.na),occs[-occs.na, ]returns and empty dataframe, becauseoccs[-0, ]is the same asoccs[0, ]. Adding thisif()statement will avoid that, making the vignette code more reproducible for any dataset.