Allow 0 width columns in sas7bdat reader #354
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This PR fixes an error when reading SAS files with zero observations (see tidyverse/haven#627). When there are zero observations SAS appears to write string variables with a default width of 0, which was throwing an error in
sas7bdat_validate_column().I've removed the check for width == 0 since this is allowed by SAS and the zero observation data file loads successfully so this check seems unnecessary.