I can propose a strategy.
This example shows that there are different types of blanks when you
look at character data.
as.character(c("", " ", " ", " "))
Your test for "" found only one of them.
Look at the data as read.csv produces it. That will probably give you
some clues.
mydata <- read.csv("filename")
mydata
as.character(mydata)
Rich
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