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[my_unzip] add exception #1678
Whenever R is compiled with no 'unzip' package installed in the underlying operation system, the getOption( 'unzip' ) variable is set to an empty string. (At least for R-3.4.0 on a vanilla Ubuntu16.04
Since the empty string doesn't trigger the if clause and its usage of the R interal utils::unzip function, I added another exception.