mediaplayer segfaults when passed in a filepath

[Christopher Lee]

I noticed mediaplayer-app being called like so in an Autopilot test:

  mediaplayer-app file:///usr/share/mediaplayer-app/videos/small.mp4 --fullscreen --desktop_file_hint=/usr/share/applications/mediaplayer-app.desktop

Narrowed it down to the following which caused it to segfault:
  mediaplayer-app file:///usr/share/mediaplayer-app/videos/small.mp4

This also makes it segfault:
  mediaplayer-app /usr/share/mediaplayer-app/videos/small.mp4

I'm not to sure how to pull more debugging details off the device, but if requested I'm happy to do so.

[Jim Hodapp (jhodapp)]

Yeah it can't create a surface without the --desktop_file_hint=/usr/share/applications/mediaplayer-app.desktop option. This flag is a requirement. So really mediaplayer-app should check that this flag is included on startup and complain if it isn't without crashing.