pipeline_compat: check compat_info pointer before using it
pipeline_compat: check compat_info pointer before using it

The compat_info pointer might not be set if ngli_pipeline_compat_init()
has not been called (and succeeded).

gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl