more fix for STORM-1468: [crashhunters] pre-login crash at...

more fix for STORM-1468: [crashhunters] pre-login crash at LLViewerWindow::LLViewerWindow(std::basic_string,std::allocator > const &,std::basic_string,std::allocator > const &,int,int,int,int,int,int) [secondlife-bin llviewerwindow.cpp]