[Merge] lp:~3v1n0/unity/blurring-crash-fix into lp:unity

[Marco Trevisan (Treviño)]

Marco Trevisan (Treviño) has proposed merging lp:~3v1n0/unity/blurring-crash-fix into lp:unity.

Commit message:
CairoBaseWindow: don't try to compute the blur of an invalid texture

Nux isn't smart enough to protect us.

Requested reviews:
  Unity Team (unity-team)
Related bugs:
  Bug #1290056 in Unity: "[ati]compiz crashed with SIGSEGV in nux::GraphicsEngine::QRP_GLSL_GetBlurTexture()"
  https://bugs.launchpad.net/unity/+bug/1290056

For more details, see:
https://code.launchpad.net/~3v1n0/unity/blurring-crash-fix/+merge/337959

As per https://errors.ubuntu.com/problem/23eed577b86c959a28589b8bb1a3bc6ee15b8694 bkg_texture is null, which leads to this error.
-- 
Your team Unity Team is requested to review the proposed merge of lp:~3v1n0/unity/blurring-crash-fix into lp:unity.
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