robots.txt help

[miracle]

Below is my robots.txt file for my forum. I just noticed that the 2nd line does not specify anything after the colon, does it hurt to leave it the way it is?

User-agent: *
Disallow:
Disallow: /lofiversion/
Disallow: /cgi-bin/
Disallow: /style_images/
Disallow: /index.php?act=Search
Disallow: /index.php?act=Login

[goodroi]

It is not the best way. I would remove that line.