replace a few checks by -n operator

diva_evaluation_cli/bin/private_src/implementation/get_system/get/get_archive.sh

@@ -5,7 +5,7 @@ location=$2
 user=$3
 password=$4
 token=$5
-install_cli=$6
+install_cli=$6  # not used
 name=$7
 
 if [[ $location != "None" ]];then
@@ -18,7 +18,7 @@ mkdir "./$archive_dir"
 cd "./$archive_dir"
 
 options="-O -J -L"
-if [[ $token != "None" ]]; then
+if [[ -n "$token" ]]; then
   curl "Authorization: Bearer $token" $options $url
 else
   if [[ $user != "None" ]] && [[ $password != "None" ]];then 
@@ -39,7 +39,7 @@ rm $archive
 
 package=`ls`
 
-if [[ $name != "" ]] && [[ $name != $package ]]; then
+if [[ -n "$name" ]] && [[ $name != $package ]]; then
   mv $package $name
 fi