d3dx9_36: Provide an empty error message in the stub D3DXCompileShader

[Paul Chitescu]

Changelog:
	d3dx9_36: Provide an empty error message in the stub D3DXCompileShader

If an error occurred it is mandatory to return an error message buffer (even 
empty) if the caller provided a non-NULL ppErrorMsgs.

Allows Magic: The Gathering - Duels of the Planeswalkers 1.2.3 Demo (Steam) to 
progress further.

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