tgstation/-tg-station — pull request #6065 by Razharas (2014-11-25 12:37:52+00:00)
Title: Fix for omnious reagent transfer error

If your glass is empty get_master_reagent_id() will return null and proc will try to add 5 units of null to glass
Took me half a hour of guessing and then one minute of testing after changing WARNING to CRASH
Lesson for future generations - 1 message with chain of calls is better than 1000 of the most elaborate of warnings, use crash for your own good kids
Fixes #1673