Don't use if around case

provision.sh

@@ -20,10 +20,9 @@ install_modules() {
 cd "$(dirname "$0")" || exit 255
 BASE_CMD="ansible-playbook playbook.yml --ask-vault-pass --ask-become-pass"
 
-if [ -z "$1" ]; then
-    $BASE_CMD
-else
-    case $1 in
+case $1 in
+    "")
+        install_modules; $BASE_CMD ;;
     os|docker)
         install_modules; $BASE_CMD --tags "$1" ;;
     reboot)
@@ -46,5 +45,4 @@ else
         usage ;;
     *)
         usage >&2; exit 1 ;;
-    esac
-fi
+esac