ports/169051: [MAINTAINER] lang/rust: use empty() to check if an option is not set

[lwhsu at FreeBSD.org]

Synopsis: [MAINTAINER] lang/rust: use empty() to check if an option is not set

Responsible-Changed-From-To: freebsd-ports-bugs->lwhsu
Responsible-Changed-By: lwhsu
Responsible-Changed-When: Thu Jun 14 07:51:01 UTC 2012
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=169051