Commits on Apr 8, 2017

1. WORKAROUND: unzip may be set to "" on some Linux systems, which cause …

   remotes::install_remote() to generate an obscure error message:
   
   Error in system_check(unzip, args) :
     Command  failed sh: : command not found
   
   Since "internal" unzip always, work this patch makes sure that is
   used also when unzip is "".
   
   See https://bugs.r-project.org/bugzilla/show_bug.cgi?id=17255 for
   more details on why unzip may become "".

   

   HenrikBengtsson committed Apr 8, 2017
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