[Rd] Patch for bug 17256 'possible bug in writeForeignSAS in the foreign library when string is NA'

[NELSON, Michael]

Attached is a patch to fix https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=17256

'possible bug in writeForeignSAS in the foreign library when string is NA'



The patch
1. fixing the case where there were NA within a character column,   and the case where all values are strings of length 0
2. general replacement of calls to `sapply` with `vapply` (and replacing any(is.na()) with anyNA.



Happy to  add in bugzilla (but don't have an account there)

Regards

Michael Nelson

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