[GRASS-stats] writeRAST fails to write empty raster

[Anna Petrášová]

Hi,

I am using R rgrass7 package and it seems that when writing a raster which
has only NA, it fails with "only numeric values may be exported":

https://github.com/cran/rgrass7/blob/386b11e5a2f3879ec63d299c0594f55cbd39c8e5/R/bin_link.R#L446

Is this intended behavior or a bug?

Thank you,

Anna
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