R1:1772410a2b6a

Allow opening editor from DarkConsole error log

Test Plan:
Click on "passing a null index to idx()" in DarkConsole.
Click on entry in stack trace.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Koolvin

Differential Revision: https://secure.phabricator.com/D2275