Correct implementation of arm arch test

softy

@@ -1182,9 +1182,7 @@ while true; do
 			fi
 			choose_webserver; install_basic; install_DashNTP; install_MySQL; install_MySQLDovecot; install_Virus; install_$server;
 			install_phpmyadmin
-			if [ "$(dpkg --print-architecture | grep armhf)" != "" ]; then
-				install_hhvm
-			fi
+			[[ -z "$(dpkg --print-architecture | grep arm)" ]] && install_hhvm
 			create_ispconfig_configuration;install_PureFTPD;
 			install_Jailkit; install_Fail2BanDovecot; install_Fail2BanRulesDovecot;
 			install_ISPConfig