Behavior of a rule if no track

[JeromeMartinez]

If I have this rule:
rule name="any audio track format must have format = FLAC" value="Format" tracktype="Audio" occurrence="*" operator="=">FLAC</rule>
and no audio track, test fails.

My point of view is that the * in occurrence means "any", and in that case the rule should not fail if there is no audio ("Audio format must be FLAC" is true, there is no audio so no audio track is not FLAC). I don't see the logic behind * and a failed test if there is no audio.