Always unload the environment

bin/vagrant

@@ -55,11 +55,13 @@ begin
   # If we're not in the installer, warn.
   env.ui.warn(I18n.t("vagrant.general.not_in_installer")) if !Vagrant.in_installer?
 
+  begin
     # Execute the CLI interface, and exit with the proper error code
     exit_status = env.cli(ARGV)
-
+  ensure
     # Unload the environment so cleanup can be done
     env.unload
+  end
 
   # Exit with the exit status from our CLI command
   exit(exit_status)