tgstation/-tg-station — pull request #5236 by phil235 (2014-10-13 16:51:40+00:00)
Title: Fixes some runtimes linked to signalers.

* Fixes the runtime error when sending signal at default frequency and code.
* Fixes the runtime from receive_signal() proc of the signaler inside a c4 that is exploding via a signal.
* Fixes the issue of the three beep message when sending signal at default frequency and code. (fixes #3781 )