scripts/selector in rvm-0.1.39 vs scripts/selector in rvm-0.1.40

@@ -190,10 +190,10 @@
       fi
   esac
 
   __rvm_gemset_select
 
-  if [[ ! -z "$rvm_ruby_interpreter" ]] && [[ "system" != "$rvm_ruby_interpreter" ]]  && [[ "default" != "$rvm_ruby_interpreter" ]] ; then
+  if [[ -n "$rvm_ruby_interpreter" && "system" != "$rvm_ruby_interpreter" && "default" != "$rvm_ruby_interpreter" ]] ; then
     if [[ ! -z "$rvm_ruby_version" ]] ; then
       rvm_release_version=$(echo $rvm_ruby_version | awk -F'.' '{ print $1 }')
       rvm_major_version=$(echo $rvm_ruby_version | awk -F'.' '{ print $2 }')
       rvm_minor_version=$(echo $rvm_ruby_version | awk -F'.' '{ print $3 }')
     fi