robario/p5-Slack — pull request #26 by h-matsu (2014-02-03 07:06:08+00:00)
Title: Fix error "uninitialized value in subtraction"

checks element of $LAST_MATCH_START and $LAST_MATCH_END are defined.

Error message:

```
Use of uninitialized value in subtraction (-) at lib/perl5/Slack/App.pm line 214.
Use of uninitialized value in substr at lib/perl5/Slack/App.pm line 214.
````