code coverage: function ivas_dirac_dec_get_response_split_order() not executed

The function ivas_dirac_dec_get_response_split_order() is currently not executed - https://ivas-codec-pc.3gpp.org/ivas-codec/coverage/lib_rend/ivas_dirac_output_synthesis_dec.c.gcov.html.

Is it obsolete or a test-case is missing?