Crash trying to throw up MessageBox from cli.

Sentry Issue: KICAD-47

EXCEPTION_ACCESS_VIOLATION_READ / 0xffffffffffffffff: Fatal Error: EXCEPTION_ACCESS_VIOLATION_READ / 0xffffffffffffffff
  File "app.cpp", line 1034, in wxApp::MSWGetDefaultLayout
  File "msgdlg.cpp", line 667, in wxMSWMessageDialog::wxMSWTaskDialogConfig::MSWCommonTaskDialogInit
  File "msgdlg.cpp", line 553, in wxMessageDialog::ShowModal
  File "utilscmn.cpp", line 1365, in wxMessageBox
  File "3d_resolver.cpp", line 351, in S3D_RESOLVER::addPath
...
(19 additional frame(s) were not displayed)