Ozkan Sezer f1cab8aea6 fix bug #5253: handle NULL title or message fields in SDL_MessageBoxData ...

- SDL_video.c (SDL_ShowMessageBox): replace messageboxdata, set title
  or message field to "" if either of them is NULL.
- SDL_video.c (SDL_ShowSimpleMessageBox):  set title or message to ""
  if either of them is NULL for EMSCRIPTEN builds.
- SDL_bmessagebox.cc: add empty string check along with NULL check for
  title and message fields.
- SDL_windowsmessagebox.c (AddDialogString): remove NULL string check
- SDL_windowsmessagebox.c (AddDialogControl):  add empty string check
  along with the NULL check.
- SDL_x11messagebox.c: revert commit 677c4cd68069
- SDL_os2messagebox.c: revert commit 2c2a489d76e7
- test/testmessage.c: Add NULL title and NULL message tests.

2020-12-10 11:20:56 +03:00

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