e324172d9ca6690e8bd2c0a53f0f7ad529d8e241

This was... horribly wrong, CDDM will often *not* need to allocate anything to return arrays of mesh items! Just check whether array pointer is NULL. Also, remove `DM_get_looptri_array`, that one is useless currently, `dm->getLoopTriArray` will always return cached array (computing it if needed).
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