Annoying and unimportant log messages

Hi!

I found a really tiny, but annoying bug. This module made tons of garbage on the log, without any information, like this:

Notice: Undefined variable: output path_breadcrumbs_breadcrumb() függvényben (/mnt/weblv/clients/client3/web4/web/sites/all/modules/path_breadcrumbs/path_breadcrumbs.module 469 sor).

I made a patch for it, please review and commit.

Bye!