nlme: failed augPred with NA in an unused column (PR#1745)

[dieter.menne@menne-biomed.de]

gsummary and augPred looks ok with

    varying <- unlist(lapply(object, function(column, frst) {
        aux <- as.character(column)
        any(!identical(aux, aux[frst])) # changed
    }, frst = asFirst))

> Von: ripley@auk.stats [mailto:ripley@auk.stats]Im Auftrag von Prof Brian
> An update was needed for 1.5.x: see file 150update.txt on
> developer.r-project.org.
> 
> On Fri, 5 Jul 2002 dieter.menne@menne-biomed.de wrote:
> 
> > Full_Name: Dieter Menne
> > nlme Version: 3.1-27




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