Crash on startup when you don't have a params file

[Pontation]

Latest master (63f023d) crashes on startup when you don't have a params file because it then tries to save the file, which in turn triggers a notification to the UI which hasn't yet been initialized. Specifically
orbitmainwindow.cpp:44 calls OrbitApp::Init() which triggers the UI notification before it calls:

GOrbitApp->AddUiMessageCallback( [this]( const std::wstring & a_Message ) { this->OnReceiveMessage( a_Message ); } ); on line 59 to initialize the callback.

Since this callback has not been set, a std::bad_call exception is thrown from OrbitApp::SendToUiNow.

I built with VS2015 Release x64 and Qt 5.9.3.

[pierricgimmig]

Thanks for reporting this! Fixed in 34c9684. Cheers