mesa: queries of non-existent FBO attachments should return INVALID_OPERATION
OpenGL 4.0 Compatibility, page 449:
If the value of FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE is NONE, no
framebuffer is bound to target. In this case querying pname FRAMEBUFFER_-
ATTACHMENT_OBJECT_NAME will return zero, and all other queries will generate
an INVALID_OPERATION error.
Reviewed-by:
Chad Versace <chad@chad-versace.us>
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