Check if growlnotify found

[ilkka]

Here's one more small thing: when calling growl() in the watchr file, check the result of which growlnotify and don't proceed if it's the empty string. This fixes watchr for platforms without growlnotify.

[nesquena]

Thanks. Merged here: https://github.com/achiu/terminitor/commit/203ab82178c5cd098523d0615475e933148720c7