how to usage check-mime-type.pl?

hollo there:
i'm Chinese Pythoner, not understand perl
so usage http://subversion.tigris.org/faq.html#auto-props
i open pre-commit hook for alert empty commit-log,
so it work... but not any message return TortoiseSVN, like snap img in atta.
or look it in Flikr:
http://www.flickr.com/photos/zoomq/84186282/

i means how to fixed check-mime-type.pl to Alert empty commit-log?

thanx for all!

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# Time is unimportant, only life important!
## 面朝开源，我心自由！

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