checks if /etc/pve is mounted (thanks Mikachu and esum)

proxmox-user.py

@@ -110,7 +110,7 @@ if __name__ == '__main__':
 		print('# | -> priv/shadow.cfg |')
 		print('# +--------------------+')
 		print(shadow_template.render(users=passwords))
-	else:
+	elif os.path.ismount('/etc/pve'):
 		with open(os.path.join(args.path, 'user.cfg'), 'w') as file:
 			file.write(user_template.render(users=users, groups=groups, acls=acls))
 		with open(os.path.join(args.path, 'priv/shadow.cfg'), 'w') as file: