Improved output for no $1 error

fp.sh

@@ -10,7 +10,7 @@ app=$(flatpak list --app | cut -f2 | awk -F. -v app="$1" '(tolower($NF) ~ app)')
 test -x "$(command -v flatpak)" || printf "Flatpak package was not found.\n"
 
 ##check if app name was entered by user
-test -z $1 && flatpak list --app && exit 
+test -z $1 && printf "Enter an app to fp.\n\$ fp <app>\n\nINSTALLED APPS\n$app\n" && exit 
 
 ##remove app name from "$@" array
 shift 1