problems with missing values created by conversion using as.matri (PR#2133)

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Create a very simple data frame containing an factor and a character vector
each containing a missing value:

	> x <- data.frame( a=c("",NA), b=c(1,NA) )

Conversion to a matrix treats the two missing values differently:

Yes, as.matrix.data.frame() uses format() to make character strings, and
it needs to check for NA as well

	-thomas



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