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libs: blend: filter: handle finalize if display isn't assigned

Víctor Manuel Jáquez Leal requested to merge vjaquez/gstreamer-vaapi:driver-without-vpp into master

I've just discovered iHD driver in Skylake doesn't have VideoProc entry point, hence, in this platform, when vaapioverlay is tried to be registered, critical warnings are raised because blend doesn't have a display assigned.

As it is possible to have drivers without EntryPointVideoProc it is required to handle it gracefully. This patch does that: only tries to register vaapioverlay if the testing display has VPP and finalize() vmethods, in filter and blend, bail out if display is not NULL.

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