dm-maim is giving an error

When I try to use dm-maim after the latest commit (f89e6df5), it is erroring out with this message: awk: line 1: regular expression compile failed (missing operand) +

There's only one line in the script that uses awk, so I'm guessing that is causing this error, but since I am not familiar with awk at all, I don't think I can fix it myself.

Hope this helps.