What happens when you open up a new club and you don’t even show up for the opening?  That question was probably on the minds of more than a few who attended the premiere night of Décor, Insomniac’s latest foray into Saturday night Hollywood entertainment.  After all, the local nightlife media had been hyping up the fact that this new club would be going head-to-head with its former business partner Giant, which had bolted from Vanguard and re-settled in its old Avalon digs.  So where was Pasquale Rotella, the founder and driving force behind Insomniac?  Well, that was no secret; he was a good hour away in San Bernardino, throwing the much-touted Nocturnal Festival at the Orange Show the same night….a handy way to duck the petty ridiculousness of L.A. clubbing politics, to be sure.  Of course, when you have …