Ignore empty non-mapped aesthetics #6011
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This PR aims to fix #6009.
Briefly, when passing
NULLor 0-length aesthetics inlayer()it will raise a warning. Previously, this would raise an error.As far as I know, there isn't any situation in which it is desirable to pass a 0-length aesthetic. Even if the data has 0-rows, nothing should be shown and no information is to be derived from a 0-length aesthetic. Note that this PR only applies to aesthetics passed outside the
aes()function.