[LyX/master] Detect when an external command crashes

commit 7032b0374801d7e2621c221ce43f409855a901d6 Author: Scott Kostyshak skost...@lyx.org Date: Sat Apr 4 13:39:42 2015 -0400 Detect when an external command crashes This fixes a situation where LyX did not detect that something went wrong (that an external comman crashed) and

[LyX/master] Detect when an external command crashes

commit 7032b0374801d7e2621c221ce43f409855a901d6 Author: Scott Kostyshak Date: Sat Apr 4 13:39:42 2015 -0400 Detect when an external command crashes This fixes a situation where LyX did not detect that something went wrong (that an external comman crashed) and