gmod_src: Fixed datapack crash on corrupt/bad cache download

Revision 766
Fixed datapack crash on corrupt/bad cache download
Delete bad cache download
Fixed memory leak in datapack loadingChanged Files:
[ul]
[li]trunk/src_garrysmod/garrysmod/GModDataPack.cpp[/li][li]trunk/src_garrysmod/garrysmod/GModDataPack.h[/li][/ul]
Committed By Garry Newman

Thanks for fixing that Niggle garry :slight_smile: