gmod_src: Added ability for runstring to keep the error on t..

Revision 863
Added ability for runstring to keep the error on the stack, instead of outputting it and popping it Changed Files:
[ul]
[li]trunk/src_garrysmod/garrysmod/g_lua/CLuaInterface.cpp[/li][/ul]

Committed By Garry Newman

Wooo, thanks!