Use wxDELETE[A]() functions which automatically NULL out their arguments after
deleting them instead of doing it manually.
Closes#9685.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64656 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Don't fail loudly if the image file is not found (which can happen under Unix
if the image sample wasn't built yet or if we're not running the sample from
its own directory) but just don't create the bitmap.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62770 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
